File:USA demographic compostion animated population pyramid.png

English: Stitched together from U.S. Census Bureau data, July 1st of each year. With NCHS data for the infant mortality rate since I wanted each year to start with total amount of children born in a cohort, so that the lowest bar actually represents all births in a year instead on the amount of 0-year olds for a specific date, and the drop represents all infant mortality.

Infant mortality rate:

1. US National Vital Statistics System https://i.imgur.com/Ebah18w.png (note the much higher mortality for the black population, I used the average for the other races). The mortality rate for other categories than white and black where assumed to follow the average. This is not a fully reasonable assumption. But the effect should be too small to be visible in this chart.

Population total:

1. 1900-1932 National Intercensal Tables: https://www.census.gov/data/tables/time-series/demo/popest/pre-1980-national.html

2. 1933-2020 U.S. Census Bureau July 1st data, provided by Human Mortality Database: https://www.mortality.org

Race data:

1. National Intercensal Datasets: 1980-1990: https://www.census.gov/data/datasets/time-series/demo/popest/1980s-national.html (adjusted hispanic due to using different definition of hispanic than the other datasets)

2. 1990-2000 Bridged-Race Population Estimates 1990-2020 - Provided by CDC https://wonder.cdc.gov/bridged-race-population.html

3. National Intercensal Datasets: 2000-2010: https://www.census.gov/data/datasets/time-series/demo/popest/intercensal-2000-2010-national.html

4. National Population by Characteristics: 2010-2019: https://www.census.gov/data/datasets/time-series/demo/popest/2010s-national-detail.html

Notes: 1. The data has been interpolated between census years before 1990. 2. Race is self identified. 3. Hispanic is exclusive of other categories. 4. A 5th-degree polynomial fit has been applied at a cohort level after 1960 as smoothening.

5. It was not possible to answer with multiple races before the 2000 census. Yet I've interpolated the race data linearly from the 1990 census, therefore it shows up slowly over the decade.