What type of plate boundary did subduction occur? convergent boundary, divergent boundary, transform boundary

Subduction is the submerging of one plate under another hence can only occur in convergent boundaries where plates are colliding head on with each other.

Explanation:

Divergent boundary- plates moving away from each other

Transform boundary- plates 'sliding' across each other

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.