History is full of mysterious tragedies and Unpredictable events, after world war 2, the merely Tensions had grown up In between the USA And USSR, both countries became two super power , and each nation tried to reduce the power of other and directly competition between both nations finally crumbled into Cold War, and that's also called, "World War .”. This period was called to be technically on peace formulation but characterized ideologically by an aggressive arms race and proxy wars. It's hard to sum up origin of the Cold War in one statement hence we had multiple causes which indicates that the Cold War happened because of triumph of Russian Revolution in 1922 and Some of them arose about when Hitler invaded Russia in 1941, we know that Roosevelt sent armaments to Russia because of Stalin and his relations were good Although after the defeat of Germany. When Stalin wanted to implement Communist ideology in Poland, Hungry, Bulgaria and Romania, which made feel England and America to suspected Stalin that what he was going to do to shape out his ideology. Various causes are responsible for the outbreak of the Cold War led differences between Soviet Russia and The United States of America, One could not tolerate the Communist ideology of Soviet Russia. On the other hand, Russia could not accept the dominance of the United States of America upon the other European Countries. The Soviet Union, the Union of Soviet Socialist Republics (USSR), took the authority and leadership of all the communist countries , and in opposed America chose the leadership of all the worldly democratic and Capitalist countries to accompany against USSR, Both rivals stood against one another. Once Hartman quoted about the Cold War, and so that we can easily understand the term which is repeatedly used hence , “Cold War is a state of tension between countries in which each side adopts policies designed to strengthen it and weaken the other by falling short by actual war.”. Cold Warr isn't about single day it lasted for several years on the map of the world, after establishing communism in Poland, Bulgaria, Romania, Hungry, Yugoslavia and other Eastern European Countries by distorting democracy, simultaneously America helped Greece and Turkey to reduce the Russia in those states, so he followed the "Truman Doctrine which came into force on 12 March 1947. In 1947 the Marshall Plan which was declared by the America to financial assistance to Western European Countries along with this Berlin blockade 1948, and establishment of NATO in 1949 made the cold was more furious thus the Cold War became halt. At that time by taking armaments from Russia and army from China, North Korea declared war against South Korea and in continuity of this phase America signed treaty with Japan on 8th September 1951, America sent military aid to South Korea by the help of “ "UN ”" However both the North Korea and South Korea signed peace treaty in 1953 and ended the war. As per contradictions, in opposed with Soviet Russia America spent a huge amount of money doing propaganda to reduce the impact of communism. On the other hand, Soviet Russia tried to be equal with America by testing atom bomb. In between 1953 – 1957) United States of America established SEATO in 1954 too reduce the influence of Soviet Russia and a lot with it formed "MEDO" in the Middle East. In short passage of time America gave military assistance, financial supports to 43 countries and formed 3300 military bases around Soviet Russia and the same time Vietnamese War started on 1955 in result of more than 3 million people (including over 58,000 Americans) were killed in the War, and more than half of the dead were Vietnamese civilians. However Russia signed WARSAW PACT in 1955 to reduce the impact of American assistances and against in it Russia also signed a defense pact with 12 Countries and did many formations for their rule to be carried on. After the death of Stalin in 1953, Khrushchev became the President of Russia. An agreement was signed between America and Russia regarding the Suez Canal Crisis 1956. It was mentioned that America won't help England and France as allies anyway and that decision saved west Asia from huge danger. After the historical tour of Russian President Towards America formed Berlin crisis and In1961, Soviet Russia made constructed Berlin Wall too check the immigration from eastern Berlin to Western Berlin and that diameter of wall was about 25 Kilometers and at that time Cuba’s Missile Crisis contributed a lot to the Cold War. That incident created an atmosphere of debate in between American President Kennedy and Russian President Khrushchev assured each other that America would not attack Cuba and the Russia must withdrew missile station from Cuba. Collapse of Soviet Union made into On December 25, 1991, most of the country had already announced that they would no longer be part of the Soviet Union. Instead, they decided they would be Independent States and Finally, the once-mighty and strongest Soviet Union had fallen, largely due to the great number of radical reforms that Soviet president Mikhail Gorbachev had implemented during his six years as the leader of the USSR. However, he was disappointed in the dissolution of his nation and resigned from his job on December 25. It was a peaceful end to a long, terrifying , and sometimes bloody epoch in the world history.