According to Polk’s message to Congress, what had Mexico done to cause a war between the U. S. and Mexico?

Explanation:

shortly before leaving office and with the support of President-elect Polk, Tyler managed to get the joint resolution passed on March 1, 1845. Texas was admitted to the union on December 29.

Explanation:  While Mexico didn’t follow through with its threat to declare war, relations between the two nations remained tense over border disputes, and in July 1845,