Answer:
False
Step-by-step explanation:
It is FALSE that United States's Abolitionists strongly supported the war with Mexico.
This is evident in the fact that the war with Mexico is about expanding territories down south of the United States which includes the likes of Texas territory which is in support of slavery.
Therefore, many of the United States' abolitionists opposed the war on moral belief and the fact that it might increase the southern power on the issue of slavery practices.