Which two conflicts did Marines participate in before World War II?

The participation of Marines in the Civil War and World War One prior to World War II highlights significant aspects of the Corps' history and evolution as a fighting force. During the Civil War, Marines played a crucial role in various campaigns, providing support for naval operations and taking part in ground battles. This period showcased the versatility and adaptability of Marine forces, laying the groundwork for their future engagements.

In World War One, the U.S. Marine Corps established its reputation as a formidable fighting unit. They participated in key battles such as Belleau Wood, where their courage and tenacity marked a turning point for the Corps, earning them the nickname "Teufel Hunden," or "Devil Dogs," from the Germans. This conflict not only demonstrated the effectiveness of Marine tactics but also solidified the Corps' place in U.S. military history as an elite force.

Recognizing this context underscores the correctness of the choice that highlights these two conflicts as integral to understanding the legacy of the Marine Corps before the onset of World War II.