Nation's credit. Fiat currency is a currency like the Dollar or Pound, where a government says it has value, it's not something that does actually have value like gold or silver. The value is determined based on the nation's credit.
The reason why the decision by the upper house might upset the lower house is because : They often did what the king wanted, regardless of the wishes of the people
Since the decision by the upper house will always override the lower house, this expose the people to an abuse of power
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Alexander Hamilton believed in larger goverment, Thomas believed the opposite.
The reasons why the United States provided loans for the Latin American countries after they gained independence from Spain were mostly of economic and political interests.
By providing loans to these newly formed nations, the United States tried to create a positive opinion by the people in these nations about them, as they would have thought that the United States are helping them to develop. The real reason why the loans were granted though was to make these nations economically dependent and connected with the United States, thus the United States to have big power over them. Also, because this is a region in the neighborhood of the United States, they wanted to make sure that they would have things under control, create good relations with these nations, and avoid any future problems.