How long was constantine the great an emperor?

Even though both ww1 and ww2 were in many ways the same conflict with basically the same countries facing off against each other, the way each war started was significantly different. the question is how what were the differences on how they started

When conducting research for forming a hypothesis, which practice should historians follow?

Which organization created jobs for blacks, whites, and native americans, improving parks, roads, and buildings? civil rights movement women’s movement environmental protection agency civilian conservation corps