What river valley civilization was almost entirely destroyed by invasion?

i believe the answer would be 1.

to extend a country’s power and influence

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.

the answer is definitley b!