President Woodrow Wilson also dabbled in imperialism although the US officially respected Mexican sovereignty it interfered in Mexican politics.
In 1913 the US ambassador to Mexico personally helped depose the legitimately elected Mexican president Francisco Madero.
The guilty ambassador lost his job but the damage was done.
Mexico's resulting instability resulted in civil wars fought by banded armies not unlike the old Roman client armies.
Sometimes the Mexican fighting spilled into the United States as did Poncho Villa's 1916 raid on Columbus, New Mexico.
An American force was sent under General John J Pershing to track Villa down but the crafty revolutionary got away.
Pershing meanwhile was gaining valuable experience for his next big assignment.
Segment 26 E conclusions.
One, manifest destiny 2 point 0.
With the frontier having been closed Americans no longer saw themselves as columnists or pioneers or cowboys moving westward to manifest destiny.