A study on interracial and cross-class marriage analyzed both Census data and federal tax records.
Notes on verification
Confirmed directly by the Harvard Gazette article and the underlying NBER/Census working paper, which explicitly describe using both Census data and federal tax records; corroborated by multiple independent hosted copies of the study.
Sources
- Why are white-Black marriage rates so low? (news.harvard.edu)
- https://www2.census.gov/library/working-papers/2024/adrm/ces/CES-WP-24-30.pdf (www2.census.gov)
- https://cowles.yale.edu/sites/default/files/2024-05/Goldman-marriage_homophily.pdf (cowles.yale.edu)
- https://benjamindgoldman.s3.us-east-2.amazonaws.com/papers/marriage_homophily/marriage_homophily.pdf (benjamindgoldman.s3.us-east-2.amazonaws.com)