Swamp Land Act of 1850

A U.S. federal law, the Swamp Land Act of 1850 essentially provided a mechanism for reverting title of federally-owned swampland to states which would agree to drain the land and turn it to productive, agricultural use. Primarily aimed at the development of Florida's Everglades, and transferring some 20 million acres (31,000 sq mi; 81,000 km²) of land in the Everglades to the State of Florida for this purpose, the law also had application outside Florida, and spurred drainage and development in many areas of the United States, including areas around Indiana's Kankakee River, Michigan's Lake St. Clair's shores, and elsewhere, and encouraged settlement by immigrants arriving in the United States after that time. Later considered to have been ecologically problematic, many of its provisions were in time reversed by the Wetland Protection Act of 1972 and later legislation, but its historical effects on U.S. development and settlement patterns remained.

In Louisiana, this law gave the state eight and a half million acres of river swamps and marshes to sell to pay for flood control measures. Under this plan, thousands of acres of virgin cypress in the Atchafalaya Basin were sold to large corporations, often for seventy-five cents per acre or less. In return, the state began the construction of a few low levees and performed periodic dredging. But an increase in flooding in the Basin, due to raft removal on the upper Atchafalaya River, gave Timber companies more water to float their products to market, allowing the complete destruction of the old growth cypress forests to ensue with little pushback.