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Year: 1787. Importance: Established America’s national government, fundamental laws, and guaranteed certain basic rights for its citizens.

Year: 1863. Importance: Declared that all slaves in the Confederate states were to be set free.

Year: 1787-1788. Importance: A series of essays urging the ratification of the United States Constitution.

Year: 1776. Importance: Declared the thirteen American colonies at war with Britain to be independent sovereign states.

Year: 1776. Importance: A pamphlet by Thomas Paine advocating independence from Great Britain to the Thirteen Colonies.

Year: 1948. Importance: An American initiative to aid Western Europe, in which the U.S. gave over $12 billion in economic assistance to help rebuild post-World War II European economies.$

Year: 1920. Importance: Granted American women the right to vote, a landmark victory in the women's suffrage movement.

Year: 1798. Importance: Four laws passed by the Federalist-controlled Congress which made it harder for immigrants to become citizens and allowed the president to detain and deport non-citizens deemed dangerous.

Year: 1791. Importance: The first ten amendments to the Constitution, detailing fundamental civil rights and protections.

Year: 1863. Importance: A speech by Abraham Lincoln during the Civil War, emphasizing the principles of human equality.

Year: 1862. Importance: Provided settlers with 160 acres of public land free of charge, except for a small registration fee.

Year: 1848. Importance: Ended the Mexican-American War and granted the U.S. significant territorial gains in the Southwest.

Year: 1781. Importance: America’s first written constitution; served as the basis for America’s national government until 1789.

Year: 1823. Importance: Asserted that the Western Hemisphere was not to be further colonized by European countries.

Year: 1964. Importance: Landmark civil rights and labor law that outlawed discrimination based on race, color, religion, sex, or national origin.

Year: 1803. Importance: Doubled the size of the United States and opened up the continent to westward expansion.

Year: 1820. Importance: An agreement passed by Congress to balance the number of slave states and free states.

Year: 1935. Importance: Created a system of old-age benefits for workers, benefits for victims of industrial accidents, unemployment insurance, aid for dependent mothers and children, the blind, and the physically handicapped.

Year: 1887. Importance: Authorized the President of the United States to subdivide Native American tribal landholdings into allotments for individual Native Americans.