Strand+6

Includes one additional strand on a single theme with at least two key elements from that strand for each of the 11 decades from 1900 to the present


 * 1900 || 1904 || [|Formation of National Child Labor Committee to rally for federal child labor laws]. ||
 * || 1909 || [|NAACP founded.] ||
 * 1910 || 1913 || [|Amendment 16 ratified, establishing US income tax.] ||
 * || 1917 || [|Russian Revolution]& [|WWI] ||
 * 1920 || 1920 || [|A woman's right to vote guaranteed by the 19th Amendment.] ||
 * || 1929 || [|Quotas set by Immigration Act.] ||
 * 1930 || 1935 || [|Social Security Act.] ||
 * || 1939 || [|Nazi Germany invades Poland] ||
 * 1940 || 1941 || [|USA enters WWII] ||
 * || 1945 || [|8/6/1945 atomic bomb dropped on Hiroshima] ||
 * 1950 || 1950 || [|Korean War begins.] ||
 * || 1955 || [|Vietnam War] ||
 * 1960 || 1961 || [|Bay of Pigs incident.] ||
 * || 1963 || [|"I Have a Dream" speech delivered by Martin Luther King.] ||
 * 1970 || 1973 || [|OPEC Oil Embargo] ||
 * || 1979 || [|Margaret Thatcher becomes Britian's first woman elected as prime minister.] ||
 * 1980 || 1981 || [|Sandra Day O'Connor appointed to the US Supreme Court] ||
 * || 1989 || [|Fall of Berlin Wall] ||
 * 1990 || 1990 || [|Nelson Mandela is freed.] ||
 * || 1990 || [|The Gulf War]. ||
 * 2000 || 2002 || [|Department of Homeland Security]. ||
 * || 2008 || [|Election of first Black to presidency.] ||
 * 2010 || 2010 || [|Republicans gain control of the US House.] ||