Why did the USA “win” the Cold War so suddenly at the end of the 1980s

One) Why did the USA “win” the Cold War so suddenly at the end of the 1980s?

Two) Has China fully rejected its communist ideology since the 1970s? Or is it trying to achieve communist ideals through capitalist methods?

Three: Despite the recent turn to populism and nationalism around the world, has the vast increase in the global middle class since 2000 ensured that the political turbulence since the Great Recession will be a passing problem as the world achieves the goals of peace and happiness that almost all religious and secular ideologies have worked towards?

I want images for each answer

resources

http://www.historyguide.org/Europe/lecture14.html

https://umuc.equella.ecollege.com/file/f84442dc-6a…

http://exhibitions.nypl.org/africanaage/essay-chal…

http://history-world.org/vietnam_war.htm

http://www.historyguide.org/Europe/lecture16.html

http://plato.stanford.edu/entries/globalization/

http://plato.stanford.edu/entries/terrorism/

http://www.unaids.org/sites/default/files/media_as…