What did Genghis Khan’s sons do after they took over his empire? They led their own wars to expand the size of the empire.
They prevented one another from crossing into each other’s territory.
They sent their soldiers to the capital to support the Great Khan.
They governed the divided empire so badly that the people revolted.

They led their own wars to expand the size of the empire

Explanation:

ok

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.