Question

during the cold war, the united states and the soviet union
clashed over control of the mediterranean sea.
broke all diplomatic ties
refused to trade with each other
formed competing military alliances

Explanation:

During the Cold War, the U.S. led NATO (North Atlantic Treaty Organization), a military alliance, while the Soviet Union led the Warsaw Pact, its opposing military alliance. The other options are incorrect: there was no major clash over Mediterranean control between the two, they maintained diplomatic ties, and limited trade occurred between them.

Answer:

formed competing military alliances