The correct answer is "he obstructed the enforcement of congressional Reconstruction policies that he felt were too harsh."
President Andrew Johnson was impeached in 1868 after he removed Secretary of War Edwin Stanton from office without first getting approval from the US Senate. President Johnson was impeached because he had violated the Tenure of Office Act.
The main reason that Andrew Jackson was not convicted after he was impeached was that some Republicans did not want to upset the balance of government.
On February 24, 1868, Andrew Jhonson was impeached by Congress. He was the first United States President to be impeached. Indeed, the House of Representatives voted eleven articles of impeachment, and the decision was taken. On March 13, the impeachment trial began in the Senate. But the Senate did not achieve the two-thirds majority needed to convict Andrew Jackson.
