Easy to read resources to look deeper into tubal ligations:

Tubal ligation Mayo Clinic

https://www.plannedparenthood.org/learn/birth-control/sterilization Planned Parenthood

https://www.vice.com/en/article/9kxam7/tubal-ligation-requirements-doctor-denials The Outrageous Reasons These Women Couldn’t Get Their Tubes Tied

https://www.cdc.gov/nchs/nsfg/key_statistics/s.htm CDC: Key Statistics from the National Survey of Family Growth