Lee wasn't in on a coup. He chose his state, which chose to secede, not overthrow. Come on, anon.
secede
/sɪˈsiːd/
verb
withdraw formally from membership of a federal union, an alliance, or a political or religious organization.
Grant owned slaves. Don't be a dupe for either party. Neither is clean. Republicans were happy to have the Freedmen's vote, just as the Dems are happy to have the Undocumented's vote.