Saturday, August 29, 2009

Carte de l'Amerique et des Mers Voisines

Mississippi River

The Mississippi River is the second-longest river in the United States, with a length of 2,320 miles (3,730 km)[4] from its source in Lake Itasca in Minnesota to its mouth in the Gulf of Mexico.
The Mississippi River is part of the Missouri-Mississippi river system, which is the largest river system in North America and among the largest in the world: by length (3,900 miles (6,300 km)), it is the fourth longest, and by its average discharge of 572,000 cu ft/s (16,200 m³/s), it is the tenth largest.
The name Mississippi is derived from the Ojibwe word misi-ziibi ("Great River") or gichi-ziibi ("Big River").

The Missouri River flows from the confluence of the Jefferson, Madison and Gallatin Rivers and is the longest river in the United States.[3] Taken together, the Jefferson, the Missouri, and the Mississippi form the longest river system in North America. If measured from the source of the Jefferson at Brower's Spring, to the Gulf of Mexico, the length of the Mississippi-Missouri-Jefferson combination is approximately 3,900 miles (6,300 km), making the combination the 4th longest river in the world. The uppermost 207 miles (333 km) of this combined river are called the Jefferson, the lowest 1,352 miles (2,176 km) are part of the Mississippi, and the intervening 2,341 miles (3,767 km) are called the Missouri.
The Arkansas River is the second longest tributary of the Mississippi River. Measured by water volume, the largest of all Mississippi tributaries is the Ohio River.
The widest point of the Mississippi River is Lake Winnibigoshish, near Grand Rapids, Minnesota, at over 7 miles (11 km) across. Also of note is Lake Onalaska, near La Crosse, Wisconsin, where the river is over 4 miles (6.4 km) wide (created by Lock and Dam No. 7) and Lake Pepin at more than 2 miles (3.2 km) wide.[5] However, the first two areas are lakes or reservoirs rather than free flowing water. In other areas where the Mississippi is a flowing river (other than Lake Pepin), it exceeds 1 mile (1.6 km) in width in several places in its lower course.
Beginning with its source at Lake Itasca to Saint Louis Missouri, the Mississippi's flow is moderated by 43 dams. Fourteen of these dams are located above Minneapolis Minnesota in the Headwaters region and serve multiple purposes including power generation and recreation. The remaining 29 dams beginning in downtown Minneapolis all contain locks and were constructed to permit commercial navigation of the upper river. Taken as a whole these 43 dams significantly shape the geography and influence the ecology of the upper river. Beginning just below Saint Paul Minnesota and continuing throughout the upper and lower river, the Mississippi is further controlled by thousands of wing dikes that moderate the river's flow in order to maintain an open navigation channel and prevent the river from eroding its banks.
The Mississippi River runs through 10 states and was used to define portions of these states' borders. The middle of the riverbed at the time the borders were established was the line to define the borders between states. The river has since shifted, but the state borders of Wisconsin, Iowa, Illinois, Missouri, Kentucky, Arkansas, Tennessee, and Mississippi have not changed; they still follow the former bed of the Mississippi River as of their establishment.
The river is divided into the upper Mississippi, from its source south to the Ohio River, and the lower Mississippi, from the Ohio to its mouth near New Orleans.

The source of the Mississippi River is Lake Itasca, 1,475 feet (450 m) above sea level in Itasca State Park located in Clearwater County, Minnesota. The name "Itasca" is a combination of the last four letters of the Latin word for truth and the first two letters of the Latin word for head.
The uppermost lock and dam on the Mississippi River is the Upper St. Anthony Falls Lock and Dam in Minneapolis. Above the dam, the river's elevation is 799 feet (244 m). Below the dam, the river's elevation is 750 feet (230 m). This 49-foot (15 m) drop is the largest of all the Mississippi River locks and dams. The origin of the dramatic drop is a waterfall preserved adjacent to the lock under an apron of concrete. Saint Anthony Falls is the only true waterfall on the entire Mississippi River. The water elevation continues to drop steeply as it passes through the gorge carved by the waterfall. By the time the river reaches Saint Paul, Minnesota, below Lock and Dam #1, it has dropped more than half its original elevation and is 687 feet (209 m) above sea level. From St. Paul to St. Louis Missouri the river elevation falls much more slowly and is controlled and managed as a series of pools created by 26 locks and dams.[8] From St. Louis to the Ohio River confluence the Mississippi free falls a total of 220 feet (67 m) over a distance of 180 miles (290 km) for an average rate of 1.2 feet per mile (23 cm/km). At the Ohio River confluence the Mississippi is 315 feet (96 m) above sea level.

A clear channel is needed for the barges and other vessels that make the main stem Mississippi one of the great commercial waterways of the world. The task of maintaining a navigation channel is the responsibility of the United States Army Corps of Engineers, which was established in 1802. Earlier projects began as early as 1829 to remove snags, close off secondary channels and excavate rocks and sandbars.
Steamboats entered trade in the 1820s, so the period 1830 – 1850 became the golden age of steamboats. As there were few roads or rails in the lands of the Louisiana Purchase, river traffic was an ideal solution. Cotton, timber and food came down the river, as did Appalachia coal. The port of New Orleans boomed as it was the trans-shipment point to deep sea ocean vessels. As a result, the image of the twin stacked, wedding cake Mississippi steamer entered into American mythology. Steamers worked the entire route from the trickles of Montana, to the Ohio river; down the Missouri and Tennessee. To the main channel of the Mississippi. Only the arrival of the railroads in the 1880s did steamboat traffic diminish. Steamboats remained a feature until the 1920s. Most have been superseded by pusher tugs. A few survive as icons—the Delta Queen and the River Queen for instance.
A series of 29 locks and dams on the upper Mississippi, most of which were built in the 1930s, is designed primarily to maintain a 9 feet (2.7 m) deep channel for commercial barge traffic. The lakes formed are also used for recreational boating and fishing. The dams make the river deeper and wider but do not stop it. No flood control is intended. During periods of high flow, the gates, some of which are submersible, are completely opened and the dams simply cease to function. Below St. Louis, the Mississippi is relatively free-flowing, although it is constrained by numerous levees and directed by numerous wing dams.

Embouchure du Fleuve St Louis ou Mississipi

Suite du Cours du Fleuve St Louis

Cours du Fleuve St Louis

New Orleans

New Orleans is a major U.S. port and the largest city in Louisiana. New Orleans is the center of the New Orleans Metropolitan Area, the largest metro area in the state.
New Orleans is located in southeastern Louisiana, straddling the Mississippi River. It is coextensive with Orleans Parish, meaning that the boundaries of the city and the parish are the same. It is bounded by the parishes of St. Tammany (north), St. Bernard (east), Plaquemines (south) and Jefferson (south and west). Lake Pontchartrain, part of which is included in the city limits, lies to the north and Lake Borgne lies to the east.
The city is named after Philippe II, Duc d'Orléans, Regent of France, and is well known for its multicultural and multilingual heritage cuisine, architecture, music (particularly as the birthplace of jazz), and its annual Mardi Gras and other celebrations and festivals. The city is often referred to as the "most unique" city in America.

La Nouvelle-Orléans (New Orleans) was founded May 7, 1718, by the French Mississippi Company, under the direction of Jean-Baptiste Le Moyne de Bienville, on land inhabited by the Chitimacha. It was named for Philippe II, Duke of Orléans, who was Regent of France at the time. His title came from the French city of Orléans. The French colony was ceded to the Spanish Empire in the Treaty of Paris (1763) and remained under Spanish control until 1801, when it reverted to French control. All of the surviving 18th century architecture of the Vieux Carré (French Quarter) dates from this Spanish period. Napoleon sold the territory to the United States in the Louisiana Purchase in 1803. Thereafter, the city grew rapidly with influxes of Americans, French, Creoles, Irish, Germans and Africans. Major commodity crops of sugar and cotton were cultivated with slave labor on large plantations outside the city.
The Haitian Revolution of 1804 established the second republic in the Western Hemisphere and the first led by blacks. Haitian refugees, both white and free people of color (affranchis or gens de couleur libres), arrived in New Orleans, often bringing slaves with them. While Governor Claiborne and other officials wanted to keep out more free black men, French Creoles wanted to increase the French-speaking population. As more refugees were allowed in Louisiana, Haitian émigrés who had gone to Cuba also arrived. Nearly 90 percent of the new immigrants settled in New Orleans. The 1809 migration brought 2,731 whites; 3,102 free persons of African descent; and 3,226 enslaved refugees to the city, doubling its French-speaking population.
During the last campaign of the War of 1812, the British sent their best forces to conquer New Orleans. Despite great challenges, the young Andrew Jackson successfully cobbled together a motley crew of local militia, free persons of color, United States regulars, Kentucky riflemen and area pirates to decisively defeat the British troops, led by Sir Edward Pakenham, in the Battle of New Orleans on January 8, 1815.
As a principal port, New Orleans played a major role during the antebellum era in the Atlantic slave trade. Its port handled huge quantities of commodities for export from the interior and imported goods from other countries, which were warehoused and then transferred in New Orleans to smaller vessels and distributed the length and breadth of the vast Mississippi River watershed. The river in front of the city was filled with steamboats, flatboats, and sailing ships. Despite its dealings with the slave trade, New Orleans at the same time had the largest and most prosperous community of free persons of color in the nation, who were often educated and middle-class property owners.
The population of the city doubled in the 1830s and by 1840, New Orleans had become the wealthiest and third-most populous city in the nation. Dwarfing in population the other cities in the antebellum South, New Orleans had, consequently, the largest slave market. Two-thirds of the more than one million slaves brought to the Deep South arrived via the forced migration of the internal slave trade. The money generated by sales of slaves in the Upper South has been estimated at fifteen percent of the value of the staple crop economy. The slaves represented half a billion dollars in property, and an ancillary economy grew up around the trade in slaves — for transportation, housing and clothing, fees, etc., estimated at 13.5 percent of the price per person. All of this amounted to tens of billions of dollars during the antebellum period, with New Orleans as a prime beneficiary.
The Union captured New Orleans early in the American Civil War, sparing the city the destruction suffered by many other cities of the American South.
During Reconstruction New Orleans was within the Fifth Military District of the United States. Louisiana was readmitted to the Union in 1868, and its Constitution of 1868 granted universal manhood suffrage. Due to the state's large African American population, many blacks held public office. In 1872, then-lieutenant governor P.B.S. Pinchback succeeded Henry Clay Warmouth as governor of Louisiana, becoming the first non-white governor of a U.S. state, and the last African American to lead a U.S. state until Douglas Wilder's election in Virginia, 117 years later. In New Orleans, Reconstruction was marked by the horrible Mechanics Institute race riot (1866), but also by the successful operation of a fully racially-integrated public school system. Meanwhile, the city's economy struggled to right itself after practically grinding to a halt upon the declaration of war in 1861, the nationwide Panic of 1873 conspiring to severely retard economic recovery.
Reconstruction ended in Louisiana in 1877, and white southern Democrats, the so-called Redeemers, succeeded in stripping power from the Republican Party and gradually circumscribing the only recently-acquired civil rights of African Americans. In New Orleans, the public schools were resegregated, and would remain so until 1960.
New Orleans' large community of well-educated, often French-speaking free persons of color (gens de couleur libres), who had not been enslaved prior to the Civil War, sought to fight back against the incipient forces of Jim Crow. As part of their ongoing campaign, they recruited one of their own, Homer Plessy to test whether Louisiana's newly-enacted Separate Car Act was constitutional. Plessy duly boarded a commuter train departing New Orleans for Covington, Louisiana, sat in the car reserved for whites only and was arrested. The case spawned by this incident, Plessy v. Ferguson, was heard by the U.S. Supreme Court in 1896. The court, in finding that "separate but equal" accommodations were constitutional, strengthened by effectively consecrating the already-underway Jim Crow movement. The ruling was a key development in the nadir of race relations reached during this period.

Plan de la Nouvelle Orleans