Question

1)

The Monroe Doctrine was established for all of these reasons except:

to keep Europe from colonizing in the Americas
for American defense
so the United States could colonize the Western Hemisphere
to keep Europe from interfering in the Western Hemisphere

2)

How did the United States change in the twentieth century?

It welcomed European influence in the Western Hemisphere.
It centered its energies upon improvement at home.
It stayed out of foreign affairs.
It was transformed into a respected world leader.