How many people supported World War 1?

Support for World War I varied by country and changed over time, but millions of people were involved in the war effort. In the United States, for example, approximately 4.7 million men and women served in the military. In total, around 65 million soldiers were mobilized from various nations, while civilian populations worldwide contributed through labor, resources, and moral support. Public sentiment initially leaned towards nationalism and patriotism, but as the war progressed, support waned in many areas due to the heavy toll of casualties and hardships.