The basin shown in this figure was actively subsiding during the formation of unit: 
Definitions:
Jeffersonian America
A period in U.S. history characterized by Thomas Jefferson's presidency and ideals, focusing on agrarian democracy, limited government, and states' rights.
Era of Good Feelings
A period in United States history characterized by national unity and a lack of partisan political divisions, roughly between 1815 and 1825.
War of 1812
The War of 1812 was a military conflict between the United States and the British Empire, primarily over British restrictions on American trade and the impressment of American sailors.
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