The Industrial Revolution was a global event between 1700-1914 that saw significant changes across multiple scales. Population growth was uneven, with growth in Europe and European-descended populations in North America and increased migrations. Cities grew rapidly in size, and the most populous cities began shifting from Asian to European cities. Wealth and economic power also shifted from Asia to Western Europe and North America as their percentage of global GDP increased. The use of fossil fuels to power new steam engines and machinery enabled more efficient production and transportation, changing global economic relationships and interactions.