On June 8, 1959, the US Postal Service experimented with mail delivery using this.

Government-issued Confederate tombstones differ from government-issued Union tombstones in this way.

In 1954, this Secretary of State announced the policy of “Massive Retaliation.”

In 354 AD, Bishop Liberius of Rome left this worldwide legacy.

Field Marshal Gebhard Leberecht von Blucher suggested this name for the Battle of Waterloo.

This patriotic painting by Archibald Willard debuted at the Philadelphia Centennial Exposition.

In 1876 Deadwood, South Dakota, averaged this number of murders per day.

Catherine Greene, widow of Revolutionary War general Nathanael Greene, provided workspace and encouragement to this inventor.