Tensions between Mexico and Texas soon erupted into open warfare.  The resulting Mexican-American War saw American troops vanquishing the Mexican army and navy on all fronts, from Texas, to California, to Mexico City.  Whig opponents of the war called it a naked grab for power and territory.  Democratic supporters called it protecting Americans from Mexicans intent on taking our freedoms, our land, and our lives.  The political infighting nearly tore the nation apart.