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In the country's best interest of freedom from tyrannical British rule, the Declaration of Independence was sent to England. This event is significant, as it was the catalyst to the United States we know of today.
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The constitution of the United States was signed, establishing a government for the people by the people. This document defines the limitations of the government and its powers, preventing the tyranny that the colonists feared.
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The Louisiana Purchase was an event that provided immense progression for the United States in terms of landmass. In the best interest of Manifest Destiny, the United States was able to double their landmass and progress westward with more ease as compared to conquest.
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After seeing the flying American flag over Fort Henry, Francis Scott Key wrote The Star Spangled Banner. This is significant, as it is now the official national anthem of the United States.
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The Battle of New Orleans was one of the last battles against Britain in the War of 1812. The US victory sparked patriotism and motivation for the Americans.
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The Monroe Doctrine served as a barrier for not only the United States, but for the entirety of America against the colonization from Europe. This is significant, because it established that the USA is sovereign and will not allow foreigners to take away from the new world.
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In order to expand westward, the Removal Act was signed to facilitate said expansion by removing the natives from their homeland. As a result, the native population decreased, and North America primarily consisted of Europeans.
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After declaring Independence from Mexico, Texas joined the United States and became the 28th state. This significantly expanded the USA being the 2nd largest state.
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The USA took Oregon from Britain to suit their interests of expansion. The British were unable to fight back, as they are more than an ocean away from Oregon.
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The Gadsden Purchase was a purchase of land from Mexico that cost the USA $10M. The land significantly expanded the country's landmass, forming the states of Arizona and New Mexico.