During which time period did the U.S. acquire Florida?

The acquisition of Florida by the United States occurred during the time period of 1810-1819, particularly culminating in the Adams-Onís Treaty, which was signed in 1819 and ratified in 1821. The context of this acquisition is rooted in America's desire for expansion and the need to address issues regarding border security and conflicts with Seminole Native Americans. The treaty allowed the U.S. to gain control of Florida from Spain in exchange for the U.S. relinquishing claims to Texas.

The other time periods listed do not correspond to the specific events or treaties associated with the acquisition of Florida. The timeframe of 1803-1804 primarily references the Louisiana Purchase, a significant expansion of U.S. territory to the west. The years 1820-1824 occurred after Florida's acquisition and do not reflect significant events concerning its transfer. The period of 1830-1835 is well after Florida became a U.S. territory and is not associated with its acquisition at all. Therefore, B is the correct choice as it accurately identifies the time frame in which the U.S. acquired Florida through diplomatic means.