Timeline of events

<tabview>
Timeline_of_modern_history_(1914-1929)|1914-29
Timeline_of_modern_history_(1930-1939)|1930-39
Timeline_of_modern_history_(1940-1949)|1940-49
Timeline_of_modern_history_(1950-1959)|1950-59
Timeline_of_modern_history_(1960-1977)|1960s
</tabview>