Tectonic plate movement is created by

Tectonic plate movement is caused by convection currents, movement of the magma within the earth in a pattern where heated magma rises, cools slightly, and then sinks below the warmer magma again.

The truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey