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Declaration of Independence is signed; 56 members of the second Continental Congress sign the declaration in Philadelphia.

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The second Continental Congress adopts the Articles of Confederation. This lines out the relationship between the States and the Country.

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Treaty of Paris, which is Britain accepting the loss of the Colonies, significant for U.S. freedom.

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The United States created the Bill of rights which allows for individual citizen rights to be outlined. Starts with 12 amendments.

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George Washington is elected the first president of the United States, important because it sets up how leaders are put into power.

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Lewis and Clark set out for Pacific and exploration of the United States' new land. This allows for more information from this exploration to be acquired.

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War of 1812 ended up with the Treaty of Ghent, due to British Violations of U.S. maritime rights, and is fought between the United States and allies against Great Britain. Allows the United States to be taken more seriously.

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The United States acquires more Mexican Territory. This allows for a increase in power and the U.S. gets bigger in size.

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Seneca Oil Company is formed and starts the birth of the oil industry. This sparks industrialization and leads to further modern development.

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Abraham Lincoln is elected president of the United States. This was opposing the expansion of slavery and helped start the Civil War.

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The confederates are defeated and slavery is abolished. In addition to this, Lincoln is assassinated. Thus marks the end of the Civil War.

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The Woolworth building, the tallest building in the world at the time is finished, highlighting U.S. developments and power.

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Movement begins to build a national highway network. This is due to the fact that it would increase transportation ease and allow for pioneering.

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Under the Nineteenth Amendment, women are given the right to vote, and is the start of more feminist movements to come.

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Start of the Great Depression as banks start to crash and disappear. Over 13 million are unemployed. An economic set back for the United States begins.

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Dust storms start on Great Plains, highlights issues with increasing population. During the Great Depression agricultural workers had to flee.

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Franklin D Roosevelt launches the New Deal and beings the United States out of economic issues, the sale of alcohol is also resumes. This is the start of the U.S. picking itself up after the Great Depression.

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Japanese planes launch attack at Pearl Harbor where a U.S. fleet is located in Hawaii. This is the start of the United States joining WWI.

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American soldiers land in Normandy, France. This allows for more grip in defeating Nazi, Germany in WWII.

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The United States launch two atomic bombs in Japan; Hiroshima and Nagasaki. This leads to Japan surrendering.