Three conflicts from 1846 to 1898 encapsulate the rapid innovations in the Army’s ability to project power. The Mexican-American War (1846-48) tested the Army’s ability to project power into foreign territory while ensuring that it was supplied, trained, and manned. The American Civil War (1861-65) tested the Union Army in projecting its force deep into enemy territory while engaging in conflicts on two fronts. The Spanish-American War (1898) was the next greatest test for the American Army, adding the dimension of oceans and fighting in battles half-way around the world. When we think of the Army’s ability to project its power today, however, it is the Spanish-American War that stands out.