1763

Charles Mason and Jeremiah Dixon began surveying the Mason-Dixon line.

1777

The Continental Congress approved the Articles of Confederation, the precursor to the U.S. Constitution.

1806

Explorer Zebulon Pike spotted the mountaintop now known as Pikes Peak.

1939

The cornerstone of the Jefferson Memorial was laid by President Roosevelt.

1969

About 250,000 protesters against the Vietnam War, the largest war protest ever, converged peacefully on Washington, DC.

2002

Hu Jintao replaced Jiang Zemin as China's Communist Party leader.

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