Which policy establishes the right of the united states to act as a policeman in the western hemisphere? , a. the roosevelt corollary, b. the open door policy, c. the gentlemen’s agreement, d. the big stick policy.

I think it is a. the Roosvelt Corollary.

Explanation:

The Roosvelt Corollary stated that the United States could intervene or use military force to keep force in Latin American countries where it is necessary.

to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.