what happened in 1850 in the united states? - EAS
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Voting rights in the United States - Wikipedia
Mass racial violence in the United States - Wikipedia
2006 United States elections - Wikipedia
Deforestation in the United States - Wikipedia
Nineteenth Amendment to the United States Constitution
Timeline of United States military operations - Wikipedia
Twenty-fifth Amendment to the United States Constitution
Industrial Revolution - Wikipedia
Health insurance in the United States - Wikipedia
Native Americans in the United States - Wikipedia