Total/all figures on child labour have been calculated as a weighted-average based on male:female ratio of 10-14 year-olds in the US from the United States Census Bureau in each respective year.

References:

Whaples, Robert. “Child Labor in the United States”. EH.Net Encyclopedia, edited by Robert Whaples. October 7, 2005. Available at: http://eh.net/encyclopedia/child-labor-in-the-united-states/

Carter, Susan and Richard Sutch. “Fixing the Facts: Editing of the 1880 U.S. Census of Occupations with Implications for Long-Term Labor Force Trends and the Sociology of Official Statistics.” Historical Methods 29 (1996): 5-24

Historical Statistics of the United States Colonial Times to 1970 (1790-1970). Available at: https://www.census.gov/library/publications/1975/compendia/hist_stats_colonial-1970.html

Sources

Data Published By: Whaples, R. Wake Forest University. Economic History Association.

Data publisher source:1880 figures are based on Carter and Sutch (1996). Other numbers are unadjusted from those reported by the Bureau of the Census

Link: https://eh.net/encyclopedia/child-labor-in-the-united-states/