The colonies declared independence from Great Britain.
The United States bought a large tract of land from France.
A conflict between the United States and countries in Europe.
Mexico and the United States fought over territory.
Conflict between the free, Northern States and the Southern, slave states.
The United States acquires Alaska from Russia.
Conflict between Spain and the United States over involvement in Cuba.
The United States built a canal in Panama to facilitate trade.
The first global war that was sparked by a complex system of alliances.
The peace treaty that ended World War One, blaming Germany for the whole thing.
The second world war that involved the first use of nuclear weapons. This war had massive amounts of civilian casualties.
This document created the United Nations, a group of allied world powers.
A time of military and political tension between the United States and the Soviet Union.
The Soviet Union tried to control Berlin by supplying necessities. The allies air lifted supplies in to counter their efforts.
The United States provided economic aid for the war torn European countries.
The North Atlantic Treaty Organization. The group aims for peaceful negotiations to avoid another world war.
A war between North and South Korea. South Korea was supported by the United Nations.
South Vietnam (aided by the United States) fought North Vietnam and their communist allies.
A nuclear crisis between Cuba and the United States.
Armed invasion of Iraq in response to the invasion of Kuwait by Iraq.
An international armed conflict that was caused by the breakup of Yugoslavia.
Intervention by NATO in the Afghanistan civil war.
Terrorists attack the Twin Towers in New York. This resulted in the United States declaring a war on terror.
A two- phase war in which American troops defeated Iraqis and created a new government.