Starts around 1911, US ends involvement around 1917
Basically, a bunch of different groups were fighting for control after some dictator stepped down. Eventually some US citizens on a boat got arrested there. The military released them and apologized, then Wilson occupied Veracruz.... Pancho Villa killed some Americans, so Wilson sent 7000 troops deep into Mexico... Wilson did not leave until 1917 in preparations for WWI.
1. Wilson was very internationalist like many of the time.
2. He was especially so with Latin America, like many others
3. Relations with Latin America got much worse, because Wilson is a twat.