Similar to Darwin’s theory of natural selection, Marx believed that the struggle between social classes eliminated imperfections that polluted society. In other words, society becomes more perfect as it evolves, thus present-day society is more perfect than past society. This is similar to how Darwin viewed animals becoming more evolved with the passage of time, thus humans are more evolved than the animals they came from but they are less evolved than the animals that will evolve from them. Herbert Spencer took the principles of Darwin and Marx and created Social Darwinism. Social Darwinists believed that the rich were better adapted to society than the poor and they opposed governmental interference. They viewed life as a competition that “weeded” out the weak thus leaving the strong to flourish. If the government interfered with this “natural selection” than the weak would be able to reproduce and pass their “weak” genes on to the next generation thus tarnishing society. The upperclass and the “robber-barons” liked Social Darwinism because they used it to justify laissez-faire