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Summary
US total fertility rate has fallen to 1.8 births per woman, remaining below replacement level for a decade. This trend, driven by delayed marriage and contraception, is projected to continue, impacting population growth.
Area of Science:
- Demography
- Sociology
Background:
- The United States experienced a post-war baby boom with a total fertility rate (TFR) of 3.8 births per woman.
- Current TFR in the US is 1.8, below the replacement level of 2.1, and has remained stable for nearly a decade.
Observation:
- Most Western countries also exhibit below-replacement fertility, with some TFRs below 1.5 births per woman.
- US population growth is sustained by immigration; without it, population decline is projected by mid-century.
- Low fertility is associated with delayed marriage and widespread contraceptive use, including surgical sterilization.
Findings:
- The US TFR has declined significantly from the baby boom peak and has persisted at a below-replacement level.
- Factors contributing to low fertility include postponed marriage and contraceptive practices.
- Historical trends and absence of counteracting social trends suggest continued low fertility in the US.
Implications:
- Low fertility rates contribute to an aging population structure in the US.
- Continued low fertility, without immigration, could lead to population stagnation or decline.
- Understanding the drivers of low fertility is crucial for future demographic and social policy planning.