America250 — 250 years since 1776. Explore two and a half centuries of American history. Start the tour
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April 20

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Anniversaries in American history that fall on April 20.

1999 · Events / Disasters
Columbine High School Shooting
The 1999 attack that reshaped how America sees school violence
Columbine High School Shooting
1871 · Eras
Ku Klux Klan Act passed
Federal government empowered to prosecute Klan violence
Reconstruction