The formations of the United States Army during the Mexican Revolution reflected the United States' desire to field modernized divisions to test the United States' preparedness for war. As these early divisions were designed to defend and fight in the United States, higher commands were divided into departments and artillery districts.
Divisions in the United States Army at this time were numbered in consecutive order and were not differentiated by type (save for the short-lived Maneuver Division and Cavalry Division).
Departments formed from 1913 included the Central Department, the Eastern Department, the Southern Department, and the Western Department. Artillery districts included the Northern Atlantic Coast Artillery District, Southern Atlantic Coast Artillery District, and the Pacific Coast Artillery District.