The US government supported Cuba in the Spanish-American War because A the government viewed Cuba as a nation in need of independence. Granted, the United States wanted Cuban independence from Spain so that the US could exert indirect political and economic control over the nation, its peoples, and its resources.
Answer b
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The treaty of Oregon signed during the presidency of Polk was between the Great Britain and The USA. its aim was to settle dispute over the Oregon country which had long been occupied by both countries.
The USA received most of the lands of the county over time, as the negotiated treaty favored the USA more than the British,resulting often to skirmishes such as the pig war.
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Both nationalism and imperialism, along with militarism, were very intertwined during this time, since nationalism created an "us vs. them" type of mentality that led countries to want to take over and occupy more territory.