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Question 1 of 4
Select all decades when...
the world population hit a multiple of 1 billion
1890s
1900s
1910s
1920s
1930s
1940s
1950s
1960s
1970s
1980s
1990s
2000s
YES
NO
2 billion in 1927, 3B in 1960, 4B in 1974, 5B in 1987, 6B in 1999. Source
Question 2 of 4
Select all decades when...
a new Pope was elected
1890s
1900s
1910s
1920s
1930s
1940s
1950s
1960s
1970s
1980s
1990s
2000s
YES
NO
1903, 1914, 1922, 1939, 1958, 1963, 1978 and 2005. See this quiz for more details
Question 3 of 4
Select all decades when...
either a World War or the Vietnam War occurred
1890s
1900s
1910s
1920s
1930s
1940s
1950s
1960s
1970s
1980s
1990s
2000s
YES
NO
WWI: 1914-1918, WWII: 1939-1945 and Vietnam: 1955-1975
Question 4 of 4
Select all decades when...
the Olympic Games were hosted in the United States
1890s
1900s
1910s
1920s
1930s
1940s
1950s
1960s
1970s
1980s
1990s
2000s
YES
NO
Summer Olympics in St. Louis (1904), Los Angeles (1932, 1984) and Atlanta (1996). Winter Olympics in Lake Placid (1932, 1980), Squaw Valley (1960) and Salt Lake City (2002)