Re: Were vs Was
Let's say I have an uncle who is still alive. He is a plumber. I could start a sentence with "If my uncle were a teacher ..." because he exists and it is perfectly possible to consider/imagine a different profession for him. In fact, he could still become a teacher.
Now assume my uncle is dead. He was a plumber. I would not be able to say "If my uncle were a teacher ..." I would have to say "If my uncle had been a teacher ...", or "If my uncle had not been a plumber ..."
The Civil Rights movement has happened. It's over. (Please don't take that as a political statement!) Therefore, anything we say about it has to refer to a hypothetical past not a hypothetical present or future.
The Civil Rights movement was successful. Had it not been successful, the world would be a very different place.
The Civil Rights movement was successful. If it had not been successful, the world would be a very different place.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.