What factors, old and new, shaped American foreign policy in the late nineteenth century? How were they interrelated?

In the late 19th century, the main US foreign policy was imperialistic.  The US was trying to expand its global reach, taking such places as Hawaii, Guam and the Philippines.

I would say that the main "old" factor was a desire for more wealth and power.  The US was pursuing these in a different way than it previously had because it was now looking to colonize other countries rather than to expand its own country.  But it was still the same idea.

I see two relatively "new" factors.  First was the idea of "white man's burden."  The US had had Manifest Destiny before, but not this idea of civilizing other people.  Second was competition with other imperial powers.  The US had not previously been interested in building an empire outside North America.