U.S.-Mexican War (Mexican-American War)

By defeating Mexico in the U.S.-Mexican War (1846–48), the United States added virtually all of the present American Southwest to the Union, together with some 100,000 Mexican citizens.

Terrorism and immigration

Modern terrorism is the use of violent, brutal force against civilians and the deliberate targeting of noncombatants for political or religious reasons.

Seven Years’ War

The Seven Years’ War (1756–63) was the culmination of a century of European warfare that centered on the growing conflict between Prussia and Austria in Europe but also involved an escalating contest between Britain and France for imperial control beyond Europe.

September 11, 2001

September 11, or 9/11, is used almost universally to identify collectively the 2001 terrorist attacks on the Pentagon in Washington, D.C., and the World Trade Center in New York City.

Revolutions of 1848

Throughout 1848, a series of liberal revolutions swept across most of western and central Europe, offering the promise of greater political and religious freedoms.

Cold war

The period of intense political and ideological struggle between democratic countries led by the United States and the Soviet Union (1945–91) and its communist satellites is often referred to as the cold war.

American Revolution and immigration

When tensions arising from the financial strain of the Seven Years’ War (1756–63) erupted into war between Britain and 13 of its American colonies in 1775, colonists were forced to take sides.