<span>Acquisition of Florida: Treaty of Adams-Onis (1819) and Transcontinental Treaty (1821) The colonies of East Florida and West Florida
remained loyal to the British during the war for American independence,
but by the Treaty of Paris in 1783 they returned to Spanish control.</span>
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Enforcing laws regarding the public safety
<span>passage of the Kansas-Nebraska Act
the secession of the Confederate states
the Supreme Court's Dred Scott decision
ratification of the Fourteenth Amendment</span>