Under the Onís-Adams Treaty of 1819 (also called the Transcontinental Treaty and ratified in 1821) the United States and Spain defined the western limits of the Louisiana Purchase and Spain surrendered its claims to the Pacific Northwest. In return, the United States recognized Spanish sovereignty over Texas.

Court ruled that Congress has the ability to regulate interstate commerce given the commerce clause because of Congress's power over national economy. Congress had ability to regulate trade and states did not share the authority to regulate interstate commerce because it dealt with national economy.

How did the Gibbons v. Ogden decision promote nationalism? It exerted a strong influence on the legal system. What ideas did The Adams-Onis Treaty contain?

The European powers, ing to Monroe, were obligated to respect the Western Hemisphere as the United States' sphere of interest. President James Monroe's 1823 annual message to Congress contained the Monroe Doctrine, which warned European powers not to interfere in the affairs of the Western Hemisphere.

The Supreme Court case McCulloch v. Maryland established that Congress had the power to establish a national bank and that a state (in this case, Maryland) did not have the power to tax branches of the federal government that are carrying out powers legal in the Constitution.

The Monroe Doctrine, starting in 1823, asserted American nationalism by marking off the Western Hemisphere as the United States' sphere of influence. This was a major move on the part of the United States and President James Monroe.

The Monroe Doctrine demonstrates American Nationalism because the United States lays claims to all of the land in the American Continents that is not already conquered.