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Napoleon invades Spain and forces King Ferdinand VII to abdicate. He places his brother, Joseph Bonaparte on the Spanish Throne. With no Spanish government on the throne - Colonies must look after themselves.
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The Dred Scott decision was the U.S. Supreme Court's ruling on March 6, 1857, that having lived in a free state and territory did not entitle an enslaved person, Dred Scott, to his freedom. In essence, the decision argued that, as someone's property, Scott was not a citizen and could not sue in a federal court.
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The Immigration Act of 1924 limited the number of immigrants allowed entry into the United States through a national origins
Britain became a naval power after beating the Spanish Armada.