What union was known for staging violent strikes against companies a. knights of labor b. national labor c. american federation of labor

a. Knights of Labor

Explanation:

The Knights of Labor were a labour organization in the United States. The union was known for staging violent strikes against companies. This organization was secret, as it wanted to protect its members from retaliation. The union was interested in dismantling capitalism and establishing a system of cooperatives that worked in a more egalitarian way. Membership in the union reached a peak in 1886.

the images of war are haunting

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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