Referring to the information below, how many time fields are there?
Definitions:
Tulsa Riot
A violent racial attack that occurred in 1921 in the Greenwood District of Tulsa, Oklahoma, often referred to as the Tulsa Race Massacre, where a white mob attacked residents, homes, and businesses in one of the wealthiest black communities in the United States.
Committee on Public Information
A government agency created by President Woodrow Wilson during World War I to influence U.S. public opinion and increase support for the war effort through propaganda.
W. B. Du Bois
An influential African-American sociologist, historian, and civil rights activist, best known for his role in cofounding the NAACP and his seminal work "The Souls of Black Folk."
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