Late modern period

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In many periodizations of human history, the late modern period followed the early modern period. It began around 1800 and, depending on the author, either ended with the beginning of contemporary history in 1945, or includes the contemporary history period to the present day.

Notable historical events in the late 18th century, that marked the transition from the early modern period to the late modern period, include: the American Revolution (1765–91), French Revolution (1789–99), and beginning of the Industrial Revolution around 1760. The Industrial Revolution was a period of major industrialization during the late 18th century and the early 19th century. It began in Great Britain and quickly spread throughout the world. This era saw a massive shift in social, economic, and cultural conditions, driven by technological innovations in manufacturing, mining, transport, and agriculture. Key developments included the use of steam power, the growth of factories, and mass production of goods.

The early 20th century was marked by two World Wars and numerous political revolutions. World War I (1914–18) and World War II (1939–45) were global conflicts that reshaped the political, social, and economic landscape of the world. These wars led to the fall of empires and redrawing of national boundaries. The period saw significant political revolutions, such as the Russian Revolution in 1917, which led to the rise of the Soviet Union, and the Chinese Communist Revolution, which culminated in the establishment of the People's Republic of China in 1949.

It took all human history to 1804 for the world's population to reach 1 billion; it only took another 123 years for the world population to reach 2 billion in 1927.^[1] From then to 1999, world population tripled to 6 billion.^[2]