Answer:
Americans stopped saving when their incomes stopped growing
The poor and middle class went into debt to buy houses
U.S. policies make it easy to not save money.
The U.S. is uniquely susceptible to conspicuous consumption.
The pressure to keep up with richer neighbors has been greatly exacerbated by rising income inequality
The objectives of new imperialism included accessing exchange courses and crude materials, spreading religious esteem, helping the vulnerable Africans as a piece of "The White Man's Burden", and increasing political predominance over different nations. The Europeans segmented off Africa to the diverse forces, from their the Europeans attacked the nations, colonized, subjugated the locals and constrained them to cultivate the crude products.
I'm no expert but considering the only other country capable of reaching it at the time was Portugal, who was focused on Africa, by the time Portugal arrived in Brazil Spain already dominated the carribean basin, England and France wouldnt arrive for a long time so it was pretty much just Spain, Spain and Portugal had also agreed how to split the findings in the new world