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During which decades did civil unrest lead to the creation of labor unions in the United States? Explain what caused this to occur.

A. Business tycoons owned factories and were reaping the financial rewards from low wages and poor working
conditions, which led to the creation of labor unions in the 1950s and 1960s.
B. After a series of protests that grew increasingly violent, the Supreme Court ruled that labor unions were legal in 1941,
which led to the creation of hundreds of labor unions in the 1940s and 1950s.
C. Business tycoons owned factories and were reaping the financial rewards from low wages and poor working
conditions, which led to the creation of labor unions in the 1920s and 1930s.
D. After a series of protests that grew increasingly violent, the Supreme Court ruled that labor unions were legal in 1921,
which led to the creation of hundreds of labor unions in the 1920s and 1930s.