Final answer:
The "Harlem Hellfighters," or the 369th Infantry Regiment, had significant experiences and contributions during World War I. They spent 191 days in combat and became one of the most decorated American combat units. However, despite their bravery, they faced racism and segregation upon their return home.
Step-by-step explanation:
The subject of this question is History and it is at the High School level.
During World War I, the experiences and contributions of the "Harlem Hellfighters," officially known as the 369th Infantry Regiment, are as follows:
- They spent 191 days in combat in France, becoming one of the most decorated American combat units of World War I.
- Due to racial segregation in the United States Armed forces, the men of the 369th were initially only allowed to serve the war effort at home.
- Despite their courage and dedication, upon returning home, they faced racism and segregation from their fellow countrymen.
The other two options provided in the question are incorrect. They did not help the Rough Riders take San Juan Hill, and they did experience discrimination and racism while serving.
Learn more about Harlem Hellfighters in World War I