The Soviet Union lost the Cold War because

When Mikhail Gorbachev assumed power of the Soviet Union in 1985, he instituted the policies of glasnost and perestroika in hopes of sparking the sluggish economy. What resulted from this taste of freedom was the revolution that ended the Cold War. That summer, a coup by conservative hardliners took place.

Explanation:

"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.

a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.