Answer:
it would be D because they based a film off of it right when it happened they launched special forces they were called 9/11 horse soldiers you can read up on it
It was segregation....wasn't it?
Secondary; The events are 100 years apart. There is virtually no chance of it being primary.
In the United States, the three main factors that make up the system of checks and balances would be the Executive Branch, the Legislative Branch, and the Judicial Branch, since the goal is to separate these powers so that no single power becomes too powerful.
I believe the centers of learning and art in the early middle ages were in monasteries.