Which type of soldiers played a crucial role in the War of 1812 and the Mexican-American War?

The Regulars, or regular army soldiers, were vital in both the War of 1812 and the Mexican-American War due to their structured training, discipline, and professional military experience. These soldiers were part of the standing army and were often better equipped and prepared for sustained campaigns than irregular forces or militias. The Regulars had established military procedures and leadership, which allowed them to execute complex maneuvers in battle and maintain order during engagements. In the War of 1812, Regulars faced British forces directly and were instrumental in significant battles, showcasing their role in defending American interests. Similarly, in the Mexican-American War, Regulars provided the backbone of the military operations, often leading successful campaigns that expanded U.S. territorial claims. Their importance lay in their ability to integrate strategy, logistics, and combat experience, which other types of soldiers may not have consistently provided.