Updated timelines

Union Timeline
HISTORIA DE LA HUMANIDAD
HISTORIA DE LA HUMANIDAD timeline
Chemistry
The Vietnam War
The Vietnam War timeline
Arthur Roland Keller
Arthur Roland Keller timeline
MI HISTORIA
Historical Timeline
The Colombian Exchange
The Colombian Exchange timeline
Miguel Asturias
Miguel Asturias timeline
Miguel Angel Asturias
Ana's Career Timeline
Historia de la educación ambiental
Historia de la educación ambiental timeline
WWI Timeline Noah Tinberg
Rick's Renaissance (1300-1600 C.E.) Virtual Museum
Rick's Renaissance (1300-1600 C.E.) Virtual Museum timeline
Prepa de Rodrigo Amaya
Prepa de Rodrigo Amaya timeline
The Vietnam War
The Vietnam War timeline