Underground Railroad: a secret organization of free blacks and whites who helped slaves escape from their masters and gain freedom in the Northern United States and Canada

Union: Northern states that remained loyal to the United States during the Civil War

Veto: a power held by the U.S. president to stop a legislative bill passed by Congress from becoming a law; a bill can become law without the president's approval only if two-thirds of each chamber of Congress vote again in favor of it; such a vote is known as overriding the president's veto

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