A key difference between the Greek city-states and the city-states of Mesopotamia, or the city-states of Mesoamerica, was that "<span>a. Most of the Greek city-states developed direct democracies," since democracy was actually "invented" in Ancient Greece. </span>
The second one is the right one
The action during the 1930s heightened the tensions between Japan and the United states is the Japan invaded Chinese Territory.
Between 1937 and 1941,escalating conflict between China and Japan influenced U.S relations with both nations, and ultimately contributed to pushing the United states toward Full-scale war with Japan and Germany.