India provided GB with the most tea, silk, and cotton. GB had the most colonies in North America and the Caribbean until they lost them. They then turned to Africa and Asia for new colonies. The works of Henri de Saint-Simon, Robert Owen, and Charles Fourier inspired Karl Marx, Friedrich Engels, and other early socialists. Marx and Engels thereby published the Communist Manifesto which cause widespread controversy in the contemporary arena of socialists, philosophers, and "social scientists".