Britain's empire expanded greatly between 1500-1900 through trading posts that became colonies, victories over France in North America and India, and exploration of Australia and New Zealand. The slave trade transported over 11 million slaves, mostly on British ships, to the New World. Industrialization through inventions like the spinning jenny and steam engine, a free market economy, and migration to cities fueled economic growth. London's population increased over six fold between 1800-1900. The Victorian Age from 1837-1901 was a dynamic period of industrial growth, political stability, and gradual improvements to living standards, fueled by resources from Britain and its empire.