Answer :

Theodore Roosevelt asserted American power with the Monroe Doctrine. It outlined the fact that the U.S. would not be controlled by European countries.
LREH

Answer:

The president Roosevelt assert American power based in the Monroe Doctrine.

Explanation:

The Monroe Doctrine was anounce around  by 1823 James Monroe but who formulated it was Mr. John Quincy Adams.

Mr. Roosevelt supported in the Monroe doctrine did a colorario at 1904.

He tried to keep this philosophy " speak  softly and carry a big stick, you will go far".

The main goal of the colorario was to invasion of Latam.