Answer:
There are several factors of the end of the Cold War. The economies of the Soviet Union and of the Easten Bloc had become stagnated and technologically backward. The subsequent worsening of living standards and the aggravation of longtime, unsolved social issues made the situation even more complicated. The perestroika and the glasnost initiated by Soviet secretary-general Mikhail Gorbachev intented to promote social, political and economic reforms but they did not succeed; they brought instead instability and protests in the Soviet republics. Besides, the election of Ronald Reagan as US president put additional pressure on the USSR. Reagan promoted systems of new weapons and an ambitious space program that could not have been matched by Moscow. This combination of economic, social and diplomatic factors led to the end of the Cold War.
After the end of the Cold War, the US became the only superpower. With confidence after what it saw as its "victory" in the Cold War, American foreign policy became more unilateral.
Explanation:
I believe the answer is c hope this helps!
A - Because they are a direct link to the events in history
Primary sources are sources that came from that time of history from the same location, time period, and era. For instance, journals from World War II from a French Military leader. These are direct links to that time in history and are the most accurate sources that are presented.
B is incorrect as even without these sources there are other methods to know about history such as secondary sources.
C is incorrect as primary sources are not the only way - again, secondary sources are a thing.
D is incorrect as secondary sources are reliable and can be trusted, but they just aren't as important and well, direct as primary sources.
Hope this helps!
