Answer:
Cause of Mexico-U.S. war
Explanation: Initially the united states declined to incorporate it into the union, largely because northern political were against the addition of a new slave state. the Mexican government was also encouraging border raids and warning that any attempt at the annexation would lead to war.
I think that fear is what best describes this propaganda poster.
Because the trade ships would take a year to bring to China and also another year to return back to the U.S. ... Because the soldiers were about to loose their farms from not being compensated for fighting int he war.