What social and political changes took place in Western Europe and the United States during the last decade of the twentieth century and the first decade of the twenty-first century?

The United States and the Western Europe gained a lot of political power because the cold war ended since the major communist states in Europe like the Soviet Union or Yugoslavia fell apart. Those who belonged to these states started supporting western ideals because they saw the failures of the communist and socialist regimes. The US grew in political power since it didn't have any global opponents, while the Europe grew because of things like the European Union which started getting more supporters.