What were the four main causes of world war 1?

What principle guided the organization of the united nations (un)?

Which of the following groups were allies against the pequot indians during the pequot war?

Which effect did the united states supreme court's decision in plessy v. ferguson have? 1. ending segregation in all public schools in america 2. protecting voting rights for african americans by eliminating literacy tests 3. upholding the rights of all citizens to be treated equally by the government 4. authorizing the system that kept black and white people separated