Here’s a free set of lesson plans covering these topics:
1| U.S. American Volunteers in World War I, 1914-1917
2| U.S. American Women’s Volunteerism and Suffrage in World War I
3| Diversity and Debate on the U.S. Home Front During the “European War”
4| Lost Generation Artists and Writers as World War I Volunteers
5| Humanitarian International Relief: A Legacy of Great War Volunteerism
6| Young People, Volunteerism, and Global Citizenship: From World War I to the Present
I’m not sure if I would do all 22 lessons, but I think it is worth a look for integration with your lessons.