The correct answer is Nuclear Disaster.
It is A and trust me i know its right
Answer: It caused competition among them. The nations of Europe were willing to _____ to preserve their power and the power of their allies. ... Nations could use war as an excuse for using their militaries to suppress internal disorder.
Explanation:
The leader who was in the USA was Jimmy carter. in Britain the prime minister was James Callaghan. However this is because the detente collapsed in 1979 after soviet invasion of Afghanistan.
As per the question however, in the 1980's the USA leader was Reagan and great Britain was Thatcher Margaret.
Balance of power is talking about the legislative, judicial, and executive branch which were all made to keep each other "balanced out" where they can check other branches and make sure that decisions being made aren't "unconstitutional" so that there wouldn't be one person with total power that could lead to a dictatorship.