Was the united states justified in sending troops to the río grande? Why or why not

yes

Explanation:

President Polk ordered the commander of the U.S. Army in Texas, Zachary Taylor, to move his forces into the disputed area near the Rio Grande River. The river formed part of the border between Texas and Mexico. Polk sent a representative to Mexico in an effort to re-establish diplomatic relations.

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.