Alliance for the Great Lakes Lake Michigan lake bottom by the Illinois legislature to a prominent Chicago university, despite disagreement about the move from other environmental organizations. Decades later, the case "Lake Michigan Federation v. U.S. Army Corps of Engineers" is a seminal decision under the Public Trust Doctrine, which prohibits the sale of public Great Lakes resources to private entities. In 2002 and again in 2008, the Alliance helped write and partner with business interests to pass the Great Lakes Legacy Act to fund Area of Concern cleanups. It helped write and pass the Great Lakes Basin Water Resources Compact to set water conservation
Great Lakes is the largest lake that is entirely within one country. The Great Lakes began to form at the end of the last glacial period around 14,000 years ago, as retreating ice sheets exposed the basins they had carved into the land which then filled with meltwater. The lakes have been a major source for transportation, migration, trade, and fishing, serving as a habitat to a large number of aquatic species in a region with much biodiversity. The surrounding region is called the Great Lakes region, which includes the Great Lakes Megalopolis. Though the five lakes lie in separate basins, they