21st century

The 21st century is the current century in the Anno Domini or Common Era, in accordance with the Gregorian calendar. It began on 1 January 2001 (MMI), and will end on 31 December 2100 (MMC). It is the first century of the 3rd millennium.

The rise of a global economy and Third World consumerism marked the beginning of the century, along with increased private enterprise and deepening concern over terrorism after the September 11 attacks in 2001. The NATO intervention in Afghanistan and the United States-led coalition intervention in Iraq in the early 2000s, as well as the overthrow of several regimes during the Arab Spring in the early 2010s, led to mixed outcomes in the Arab world, resulting in several civil wars and political instability. The early 2020s saw an increase in wars across the world, including a major escalation of the Russo-Ukrainian war and the Gaza war. Meanwhile, the war on drugs continues, with the focus primarily on Mexico and the rest of Latin America. The United States has remained the sole global superpower, while China is now considered to be an emerging superpower.

In 2022, 45% of the world's population lived in "some form of democracy", although only 8% lived in "full democracies". The United Nations estimates that by 2050, two-thirds of the world's population will be urbanized.

The world economy expanded at high rates from $42 trillion in 2000 to $101 trillion in 2022, and though many economies rose at greater levels, some gradually contracted. Effects of global warming and rising sea levels exacerbated the ecological crises, with eight islands disappearing between 2007 and 2014.