King George III reigned over Britain from 1760-1820 during a period of major social, economic, and political changes. Britain fought against France for colonial dominance and industrialized rapidly during the late 18th century through innovations like James Watt's steam engine. Growing industrialization and enclosure of agricultural lands transformed British society and led to conflict between new social classes of landowners, industrialists, and wage laborers who faced difficult working conditions. The American colonies declared independence from Britain in 1776, marking the end of Britain's global supremacy.