<em>Impeached </em>means accused of a crime. Andrew Johnson was the first president to be impeached. He was accused of breaking the law, because many congressmen thought he was being too nice to the South after the War. He was found not guilty by just one vote. Years later, he became the only ex-president elected to the Senate.
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Andrew Johnson was impeached for dismissing Secretary of War Edwin Stanton without the approval of the Senate as required in the Tenure of Office Act and for attacking congressional policies on the Reconstruction in the South.
The Battle for Guadalcanal is important because Allied forces finally began to take the offensive for the first time in the Pacific. This battle was held from August 7th, 1942 to February 9th, 1943.