What was the MAIN reason for the impeachment of President Andrew Johnson?

Question

widespread public opposition to his aggressive American Indian policy
his lack of support for the extension of civil rights to African Americans
a power struggle with Congress over his Reconstruction policy for the South
his plan to pack the Supreme Court with judges favorable to his political positions

Answer 1

The MAIN reason for the impeachment of President Andrew Johnson was a power struggle with Congress over his Reconstruction policy for the South.