How many PEOPLE have served in World War I??

This site lists the Allied military forces in WWI.

http://en.wikipedia.org/wiki/Allies_of_World_War_I

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To find out how many people served in World War I, you can follow these steps:

1. Verify the data source: Confirm reliable sources to ensure accurate information. Historical records, government archives, or academic research are good places to start.

2. Consult official records: Many countries kept detailed records of their citizens who served in the war. Check with national archives or military institutions for access to enlistment records, draft registrations, or military service files.

3. Analyze census data: Census records provide valuable information about populations before and after the war. Compare statistics from pre-war and post-war census reports to estimate the number of people involved in military service.

4. Consider international records: World War I involved numerous countries, so examining records from various nations can provide a comprehensive estimate. International databases or documents from intergovernmental organizations might contain aggregated data.

5. Review historical research and studies: Historians, scholars, and experts often conduct research on large-scale events like World War I. Assess their findings and conclusions to gain insights into the number of individuals who served during this period.

It is important to note that the exact number of people who served in World War I can vary depending on various factors, including the different criteria used to define individuals as "those who served." Additionally, gathering accurate data for such a historical event might still involve some degree of estimation or uncertainty.

By following these steps and cross-referencing multiple reliable sources, you can obtain a more accurate approximation of the number of people who served in World War I.