Answer:
1# D.The major differences between the North and the South caused sectionalism in the United States, leading to compromise between the regions.
2#C: It set the standard that new states could decide whether to ban enslavement or not.
3#B.Adams won a majority of the popular vote but lost the election because Jackson had more Electoral College votes.
4#B: enacting the Tariff of 1828
Explanation:
The Czechs and the Hungarians is the answer.
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The great depression in 1929 is widely accredited to have been started by the Wall street crash, the drastic and fast fall in stock prices on the US stock market.
If only one company provides a service it can monopolize that sector and cause price gouging. If several companies provide a service and those companies must be competitive with each other to attract business/customers.
