since the usa and soviet liked to test their atomic bombs they decided to go against eachother. Relations between the Soviet Union and the United States were driven by a complex interplay of ideological, political, and economic factors, which led to shifts between cautious cooperation and often bitter superpower rivalry over the years. it prevented them from reaching a mutual understanding on key policy issues and even, as in the case of the Cuban missile crisis, brought them to the brink of war. The Soviet regime proclaimed a policy of détente and sought increased economic cooperation and disarmament negotiations with the West. These tensions continued to exist until the dramatic democratic changes of 1989–91 led to the collapse during this past year of the Communist system and opened the way for an unprecedented new friendship between the United States and Russia, as well as the other new nations of the former Soviet Union.
It left behind a rich layer of soil which was fertile and full of nutrients great for agriculture. This enabled Egypt to be established as one of the early civilizations.
