What physical feature had the greatest effect on China's contact with other countries? O Vast, flat deserts made northward trave
l easier. O Extensive highlands made westward travel difficult. O River systems nelped travel between north and south. O High, dangerous mountains blocked southward travel.
Stalin signed a nonaggression pact with Germany because he knew that Europe was on the brink of another major war, and he wanted time to be able to build up the Soviet military.
