Final answer:
Adolf Hitler served as an infantryman in the German army during the First World War. His experiences during that time fueled his resentment for the Treaty of Versailles, fueled his ideologies, and led to the Second World War.
Step-by-step explanation:
Adolf Hitler served as an infantryman in the German army during the First World War, also known as World War I. Following his service in the war, Hitler developed a deep-seeded resentment towards the Treaty of Versailles and rose up the ranks of the Nazi party. After gaining power, he led Germany into the Second World War.
During the First World War, militaries worldwide, including that of Germany, significantly ramped up due to the scale and severity of the conflict. Germany had a substantial force with 4.5 million soldiers at the beginning of the war, far outnumbering the U.S. Army at the time, which was the seventh-largest globally.
The experiences Hitler had during his service in World War I fueled his subsequent ideologies and political moves, which led to the atrocities of World War II.
Learn more about Adolf Hitler's service in World War