The Mongol Yuan Dynasty (1271–1368) under Kublai Khan was the first to rule all of China as foreigners.

Ancient Greek triremes were warships with three rows of oars.

Fact #1450 · History

The NSA’s ECHELON system monitored international communications during the Cold War.

Fact #1058 · History

Ancient warfare often involved close-quarters combat.

Fact #1452 · History

The Homestead Act encouraged westward expansion in the 19th century.

Fact #1120 · History

The United States Constitution is one of the oldest written national constitutions still in use.

Fact #1116 · History

The discovery of vaccines reduced childhood mortality rates.

Fact #1211 · History

The Articles of Confederation preceded the U.S. Constitution.

Fact #1135 · History

The Roman army used standardized equipment for efficiency.

Fact #1440 · History