Updated timelines

1921-1941
Presidentes de 1940 a 1982
Historia de los sistemas computacionales
U.S. Hist. II: 1900-1920
Games
1900-1920
1900-1920 timeline
1876 - 1900
1876 - 1900 timeline
1876-1900
1876-1900 timeline
Video game Timeline
Introduction into the Somali Language
Introduction into the Somali Language timeline
History of America
Atomic Model
Atomic Model timeline
Video Games and New Media
1876-1900 (Kaitlyn Qualls)
1876-1900
1921-1941