The cold war started because the US believed in capitalism,while the USSR believed in Communism. Capitalism is when people can own businesses. The people get paid more depending on how hard you work and the quality of your work. Capitalism supports free markets. Its made up of Three social classes Rich,middle class,and the poor. It appeals to the rich. While in communism the government owns the businesses and controls how much the people get paid. So there's no social classes. This appeals to the poor. ByMartin Solinger