Old factors: Manifest Destiny and Monroe Doctrine.
New factors : Imperialism and Social Darwinism.
The are interrelated that they all establish that America is superior and must expand to "help" other countries live the right way, the American way.
U.S.A also wanted to have markets in the countries it colonized and to have Naval Bases on the pacific.
Cotton
Hawaii's tobacco industry grew in the late nineteenth century. This and the American desire for more tobacco strengthened ties between the two.
in Europe
The nineteenth century was from 1800 - 1899.
Slavery
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Twentieth-century literature covers a broad range of subjects from diverse contributors.
the abolition movement
immigration
Artists conveyed the power and beauty of the American landscape.
In the early nineteenth century, American Protestants had a major evangelizing movement to attract members. Retention was accomplished by making churches the center of social life.
Nineteenth-Century Literature was created in 1945.