Which factor most greatly limited union growth at the end of the 19th century?

One of the greatest factors that hurt the growth of labor unions in the late 1800s was the Pullman Strike in 1894. The strike ended with federal troops killing over a dozen strikers and injuring many others. This event, in which federal troops unambiguously sided with the Pullman Company, hurt the cause of labor unions and made striking seem like a more dangerous thing to do. 

Ending prohibition in oklahoma schools

If i remember correctly it was caused by people hurling bodies at a country for some reason and them they all became infected