After which cold war event did the united states and the soviet union enter a nuclear arms race?

When an imperial power has political control, what is the territorial called

Two of these describe "federalism." (choose two answers) select one or more: a. the national government absolutely controls all state governments. b. power is shared by the national and state governments. c. state governments exercise absolute power over the national government. d. it is a compromise meant to eliminate the disadvantages of a "unitary" and a "confederate" system.

What is the value of x? enter your answer in the box. x =