Which was a major cause of environmental pollution in american cities during the late 1800s?
a. wastewater discharge from hydroelectric power plants
b. chemicals used in dry cleaning shops
c. large numbers of horses used for transportation
d. dust storms blowing in from the great plains

What led to the creation of suburbs in the early 1900s

Explain the importance of president harry truman's order to integrate the u.s. military and the federal government.

How did the boston massacre contribute to the writing of the declaration of independence? a. many colonists began to see the british government as a source of protection. b. many colonists began to see the british government as a supporter of free speech. c. many colonists began to oppose the british government's building of forts on the frontier. d. many colonists began to fear the british government's harsh actions toward the colonies.