Well, the Soviets were fighting with the Allies in World War II and were playing a big role, considering they were most of Eastern Europe. So the U.S. sent support to prevent the Germans from gaining anymore territory from the Russians. Hope this helps..
Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct responses would be "new information comes to light" and "old theories are discredited". </span>