[92]
In 1824, the Supreme Court ruled in Gibbons v. Ogden that the Constitution's Commerce Clause gave the federal government the authority to regulate interstate commerce. Shortly thereafter, Congress passed two important laws that, together, marked the beginning of the federal government's continuous involvement in civil works. The General Survey Act authorized the president to have surveys made of routes for roads and canals "of national importance, in a commercial or military point of view, or necessary for the transportation of public mail". The president assigned responsibility for the surveys to the Army Corps of Engineers. The second act, passed a month later, appropriated $75,000 to improve navigation on the Ohio and Mississippi rivers by removing sandbars, snags, and other obstacles. Subsequently, the act was amended to include other rivers such as the Missouri. This work, too, was given to the Corps of Engineers—the only formally trained body of engineers in the new republic and, as part of the nation's small army, available to serve the wishes of Congress and the executive branch.