Final answer:
The United States Navy launched its first iron warship, USS Michigan, on the Great Lakes in 1843.
Step-by-step explanation:
The United States Navy launched its first iron warship, USS Michigan, on the Great Lakes in the year 1843. During the War of 1812 between the United States and Britain, the Americans had a small navy compared to the British. However, with the development of iron warships, the United States Navy gradually improved its capabilities, and the USS Michigan was one of the first iron warships commissioned by the United States Navy.