What effect would Mexico declaring war on the United States have on American involvement on the Western Front of World War I? Please hurry

It would cause America to suffer from diseases from Mexico could cause Americans to die from it especially in war it will make America's territory expand since the Mexicans would potentially lose their territory for the lack of technological advances made to fight war.

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.