What was a direct outcome of the US entering World War I in 1917?

The U.S. entering World War I in 1917 led to a significant expansion of the military aviation branch, which was crucial for various operations during the war. As the conflict escalated, the need for more aircraft and trained pilots became urgent, prompting the government to invest heavily in military aviation. This included the establishment of training programs and the formation of dedicated aviation units to support the war effort.

The rapid increase in military needs required a more robust organizational structure for aviation, leading to the expansion of existing branches and the creation of new ones. The growing recognition of air power as a vital component of military strategy propelled the United States to enhance its aviation capabilities significantly. This established a foundation for future developments in military aviation in subsequent conflicts, including World War II and beyond.

While the other choices address elements that also saw advancements during this period, such as the development of new aircraft and factories, the core shift directly linked to the U.S. entry into the war was the expansion of military aviation itself, which included both structural and personnel growth tailored to the demands of a large-scale conflict.