Reuben Kemper led a small force in an attempt to capture Mobile from the Spanish on behalf of the new republic, but the expedition ended in failure.
In 1810 the United States, citing the Mobile Act of 1804, justified its annexation of the Baton Rouge District, which had been under the control of the unrecognized Republic of West Florida.
The District, however, was later declared by Congress to be annexed to the United States on May 14, 1812,[1] immediately prior to the start of the War of 1812 with Great Britain, with whom Spain was allied.
Nearly a year later, a U.S. military force arrived in Mobile to formally accept the presiding Spanish commander's surrender.
Today the former Mobile District forms the southernmost sections of two states, Mississippi and Alabama.