George Washington led the Continental Army and was unanimously elected as the first President of the United States. His leadership set many important precedents for the new nation.

The Declaration of Independence was adopted in 1776, marking the colonies' formal separation from British rule. This event set the stage for the creation of the United States and its foundational ideals.

The U.S. Civil War, fought from 1861 to 1865, was primarily about issues including states' rights and slavery. It remains one of the most defining conflicts in American history.

The Constitution is the foundational legal document that outlines the structure, powers, and limits of the U.S. government. It has played a crucial role in shaping American law and governance.

The Legislative Branch, composed of the House of Representatives and the Senate, is tasked with drafting, debating, and passing federal laws. This branch plays a vital role in the legislative process of the U.S. government.

The expedition was commissioned to explore the vast territory acquired through the Louisiana Purchase and to map the new lands. It provided critical information about the geography, resources, and indigenous populations of the American West.

After World War II, the United States strongly embraced capitalism, which prioritized free enterprise and market-driven growth. This economic system contributed to the post-war boom and the expansion of consumerism.

The Brown v. Board of Education decision declared that racial segregation in public schools was unconstitutional, overturning the 'separate but equal' doctrine. This ruling was a major victory for the civil rights movement and set a legal precedent for further desegregation.

The Battles of Lexington and Concord marked the first armed conflicts between colonial militias and British troops, prompting the Revolutionary War. This event is celebrated for igniting the struggle for American independence.

The First Amendment guarantees vital freedoms such as speech, religion, press, assembly, and petition. This amendment is a cornerstone of American democratic values and civil liberties.

The aggressive policy of unrestricted submarine warfare by Germany, which led to the sinking of vessels carrying American passengers and goods, was a key factor in shifting public opinion towards joining World War I. This act challenged American neutrality and paved the way for U.S. involvement.

Franklin D. Roosevelt introduced the New Deal to help the nation recover from the Great Depression. His policies expanded the role of the federal government in providing economic relief, recovery, and reform.

The Battle of Trenton was a pivotal victory during a harsh winter, boosting the morale of the Continental Army. This win helped to reinvigorate the American cause at a critical phase in the Revolutionary War.

The Gilded Age was marked by rapid industrial growth and urban expansion, which led to significant economic and social changes. It also exposed issues such as income inequality and labor exploitation that later spurred reforms.

The civil rights movement was primarily focused on ending racial segregation and discrimination, striving for equal rights and justice for all citizens. Its successes led to significant legal and social reforms that reshaped American society.

Manifest Destiny was the belief that United States expansion was both justified and inevitable, offering a moral rationale for acquiring new territories. This ideology often led to policies that neglected the rights of Native Americans, resulting in their displacement.

The Great Depression severely impacted American society with widespread unemployment, poverty, and social disruption. These hardships led to significant government intervention and a rethinking of economic and social policies to protect citizens.

The Brown v. Board of Education decision was a turning point that challenged segregated educational systems and laid the groundwork for broader civil rights reforms. Its impact was far-reaching, setting legal and moral precedents for subsequent anti-discrimination legislation.

Cold War policies were driven by the need to contain communism, resulting in increased military spending and active involvement in international alliances and interventions. These policies influenced both U.S. foreign and domestic strategies, reshaping national security and economic priorities.

Technological advancements during the Industrial Revolution drastically changed production methods, leading to increased efficiency and economic growth. These changes not only transformed industry but also led to urbanization and shifts in social structures across the nation.