You could have at least picked an objective source Tom.
To be perfectly honest it was the Truman administration that developed and implemented the strategy that played the key role in bringing the USSR down. Reagan certainly played a significant role but the strategy and ergo the credit belongs to Truman and that is why Truman is considered a great President and Reagan an above average one. There is no arguing that liberal internatiolism, as advocated by Truman and what eventually became known as the Truman Doctrine, which contained the Soviet Unions expansionism and provided generous foreign financial aid in modernizing at risk nations and regions to prevent the growth of communist movements in undeveloped countries is what won the Cold War. Reagan was remarkable for a Republican in that he rejected traditional conservative policies of isolationism, realism and noninterventionism and fully embraced liberal internationalism, that is the Truman Doctrine, with its military aid and nation building, despite strong opposition from the conservative wing of the Republican Party.
https://en.m.wikipedia.org/wiki/Truman_Doctrine