The Louisiana Purchase in 1803 doubled the size of the United States.

The Triassic period marked the first appearance of dinosaurs.

Fact #664 · History

The Permian extinction eliminated most marine species.

Fact #717 · History

In 1962, a U.S. submarine nearly launched a nuclear torpedo during the Cuban Missile Crisis.

Fact #788 · History

The Phoenicians were skilled sailors and traders.

Fact #648 · History

The Persian Empire built a vast administrative system.

Fact #653 · History

In 1692, the Salem witch trials led to the execution of several individuals in Massachusetts.

Fact #778 · History

The NSA's PRISM program collected digital communications under classified authority.

Fact #1048 · History

Operation Northwoods was a proposed U.S. plan in the 1960s that was never carried out.

Fact #1045 · History