The US victory on <span>December 29, 1890 </span>at the battle of Wounded Knee (also known as the Wounded Knee massacre) was largely influential to the American control of the west because it represented the last major conflict between the US government and American Indians. The second option is the correct answer.
The scientific knowledge help the building of the panama canal because : fewer workers got sick from malaria and yellow fever
Back then, the building of panama canal was stunted because a lot of workers were injected by the disease and causing them unable to work. Colonel Gorgas , the chief medical officer appointed for the project read some discoveries regarding the treatment of the diseases and managed to cure a lot of workers
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Adding more territories to the south of the United States would create potential for the expansion of slavery, and an increase in the number of slave state representatives and senators in Congress, which would upset the contemporary balance of free to slave states.
Answer:
The middle class is a class of people in the middle of a social hierarchy. Its usage has often been vague whether defined in terms of occupation, income, education or social status. The definition by any author is often chosen for political connotations. Writers on the left favor the lower-status "working class". Modern social theorists—and especially economists—have defined and re-defined the term "middle class" in order to serve their particular social or political ends.