Who was the last communist leader of the soviet union befor it collapsed?

What kind os source would a historian use to get a firsthand account of a past event

Which is true about pontiacs war in 1763

Why were americans concerned about the future of north and south america? check all of the boxes that apply. they worried that european countries would take over independent countries in latin america. they thought that european nations could threaten democracy in the united states. they believed that europe would never again return to the americas.