the answer is C, the OPEC oil embargo :)
I believe it's B not 100% sure though
<u>National Labor Union</u> is the labor union established by William Sylvis during 1866.
William H. Sylvis was an ironworker who managed to get 640,00 members during 1868 for the National Labor Union (NLU), the first labor union. The workers he united were either skilled or unskilled workers.
Sylvis is a unique labor leader. Through the creation of a labor party and the strengthening of international solidarity, Sylvis aimed to advance worker rights and strengthen the position of labor. Consequently, William Sylvis, the pioneer trade union leader in America, stands out for his dedication to independent political change, international co-operation, and even the sporadic bring up of the possible consequence of violent revolution.
Learn more about the goal of unions like the national labor union and the knights of labor: brainly.com/question/2067339
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It was factory system assembly because then they had lots of companies that would make weapons for them
