Second millennium AD

Millennia:	1st millennium 2nd millennium 3rd millennium
Centuries:	11th century 12th century 13th century 14th century 15th century 16th century 17th century 18th century 19th century 20th century

The second millennium was a period of time that began on January 1, 1001 and ended on December 31, 2000 of the Gregorian calendar. It was the second period of one thousand years in the Anno Domini or Common Era.

It encompassed the High and Late Middle Ages, the Mongol Empire, the Renaissance, the Baroque era, the early Modern Age, the age of Enlightenment, the age of colonialism, industrialization, the rise of nation states, and the 19th and 20th century with the impact of science, widespread education, and universal health care and vaccinations in many nations. The centuries of expanding large-scale warfare with high-tech weaponry (of the World Wars and nuclear bombs) were offset by growing peace movements, the United Nations, plus doctors and health workers crossing borders to treat injuries and disease, and the return of the Olympics as contest without combat.