Public support for the labor union movement during the late 19th century decreased when A.) it became associated with violence and political radicals
B.) the government passed laws establishing an eight-hour workday
C.) leaders refused to accept women and foreign migrants
D.) members began losing their jobs to "strike breakers"

in my head says that some of A or C

Explanation:

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b) race riots in several cities

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation: