First, Andrew Johnson was never impeached. He was tried for treason after he fired Edwin M. Stanton, the secretary of war, from office. He was extremely close to being impeached—just 1 vote short. Radical republicans attempted this because they disagreed with his reconstruction plan. Make sense?
It was the "c. Nineteenth Amendment" to the Constitution that gave women the right to vote in the United States. This was the culmination of many years of effort.