Ivan IV or Ivan the terrible
No he's more or less a fictional character in a movie. There was a Thomas Gates who was a general but had nothing to do with the assassination.
The answer is B, they practiced respecting & worshipping ancestors.
Assuming you're still referring to the Fifteenth Amendment, many critics pointed out that the newly-freed slaves lacked the proper amount of education to make informed voting decisions, and that it would be detrimental to the state to have them vote in general and local elections.