(5th millennium BC - 4th millennium BC - 3rd millennium BC)
Significant persons:
Inventions, Discoveries, Introductions:
... Centuries: 19th century - 20th century - 21st century Decades: 1850s 1860s 1870s 1880s 1890s - 1900s - 1910s 1920s 1930s 1940s 1950s Years: 18 ...