What is president johnson's opinion of the confederate states of America and the concept of secession?

Andrew Johnson happens to be the 17th president of US. The confederate states of America refers to a group of states which supported slavery of Africans as their economy was dependant on Agriculture. The considered white people above the black.

Johnson was against slavery and did a great work to abolishment of slavery and re-joining of the confederate states. He was also against the concept of secession as when other states were forming confederate states including Tennessee, he stood firmly with the union.