21st century

preceding century: 20th century | proceeding century: 22nd century

In the 21st century,

• Mega-City One was built, incorporating New York and other settlements on the Eastern seaboard of the U.S.A..

• The Great Robot War took place, a world-spanning conflict between North and South, East and West.

Decades in Century

2000s • 2010s • 2020s • 2030s • 2040s • 2050s • 2060s • 2070s • 2080s • 2090s