Why did the United States and the Soviet Union have to proceed more carefully in international affairs after both developed nuclear weapons?

Explanation:

The world has changed a great deal in the last decade and a half. The Cold War stand-off

with the Soviet Union is over, and Russia is no longer an ideological adversary. The

United States has made historic reductions in its operationally deployed strategic nuclear

forces and plans to reduce them to a level of 1,700 to 2,200 by 2012, as called for by the

Moscow Treaty. The U.S. has also greatly reduced its non-strategic nuclear forces and

the total nuclear warhead stockpile. These significant nuclear reductions are fully

warranted in the new security environment.

The United States continues to maintain nuclear forces for two fundamental reasons.

First, the international security environment remains dangerous and unpredictable, and

has grown more complicated since the dissolution of the Soviet Union. Political

intentions can change overnight and technical surprises can be expected. Second, nuclear

weapons continue to play unique roles in supporting U.S. national security. Although not

suited for every 21st century challenge, nuclear weapons remain an essential element in

modern strategy.

the fact that could also be added to column b is that during world war ii, specifically between the years 1941 and 1945, japan expanded its territory towards the indonesian territory in what was known later as part of the "pacific war". in that time, japan could conquer the philipines, singapore,   borneo, central java, malang, cebu, sumatra and various other islands of the area, therefore expanding its territory for a brief period of time.

literally just took the test, got a 100%. i couldn't be bothered to type it all out, so i just took pictures.

should be in order from q 1 to 35.