A frame of reference is a point or set of fixed points relative to an object describing a motion, and affects on the movement you perceive for the object.
For example, if you throw a stone from the window of a car, you'll see a different trajectory depending on whether you take the road or the car as the frame of reference. On the first situation you'd notice a trajectory, while from the car you'd see the stone almost falling to the ground only.
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They feared India would erupt into civil war between muslims and Hindus. The country was deeply divided along the region and in result they did not want India to have their independence so Britain would have more power,
The answer is C. Cities grew rapidly in a period known as Urbanization. People came to cities to look for new jobs and many other reasons.
Sweatt vs Painter was a US Supreme Court case that successfully challenged the "separate but equal" doctrine of racial segregation established by the 1896 case Plessy vs Ferguson. The case involved a black man, Herman Marion Sweatt, who was refused admission to the School of Law of the University of Texas.