A huge study published in JAMA Network Open, has uncovered significant differences in life expectancy across the United States, exposing how deeply geography, public health policy, and socioeconomic conditions shape the lives, and lifespans of Americans (Holford, McKay, Tam, Jeon, and Meza, 2025).1 Led by researchers from Yale University, the University of Michigan, and the University of British Columbia, the study offers an interesting view of mortality trends by birth, by analyzing over 179 million deaths across all 50 states and the District of Columbia (D. C.), based on people born from 1900 to 2000. The study showed that while many states in the Northeast, West, and D.C. experienced dramatic gains in life expectancy between 1900 and 2000, Southern states such as Mississippi, Alabama, and Kentucky saw stagnating progress, particularly among wome In New York and California, life expectancy increased by over 20 years. In some Southern states, women saw gains of less than 3 years over the entire century. After 1950, men in many Southern states saw life expectancy increases stall at less than two years, highlighting a widening gap that persists today. The study examined how quickly death rates increased after age 35, a measure of aging health. States with slower increases in death risk, like New York and Florida, had longer "doubling times" (over 9 years for females and over 11 for males). States like Oklahoma and Iowa had faster increases, indicating less healthy aging patterns. The researchers applied an age-period-cohort model using detailed mortality data from national databases. By tracking individuals by “birth cohort”,rather than simply summing and comparing annual death rates, they revealed how the historical, social, and environmental conditions people are born into can shape their health outcomes over a lifetime. This approach allowed the team to identify long-term effects of:
According to Dr. Theodore Holford of Yale, “These disparities are not historical accidents. They reflect decades of differences in policy, healthcare access, smoking prevalence, environmental exposure, and economic inequality.” Dr. Jamie Tam, a co-author and assistant professor of health policy, emphasized that poverty and weak public health systems remain key barriers to progress in states with poor outcomes. Washington D.C. showed the biggest gains in life expectancy. Once at the bottom of life expectancy rankings in 1900, D.C. posted the largest improvements, with gains of 30 years for females and 38 years for males by 2000. Researchers credit progressive urban policies, improved healthcare access, and changing demographics. Does that sound similar to political doublespeak? The researcher's observations are undoubtedly true, of course, but why did these changes and the health trends that they generated, occur in the first place? The study didn't investigate this, but everything occurs for a reason. There's a very good chance that these changes occurred mostly because the federal government headquarters are located in Washington D.C. As of July 2022, for example, approximately 25% of the workforce in Washington, D.C. were employed directly by the federal government. In addition to direct federal employment, a substantial portion of D.C.'s economy is tied to politics-related sectors, including:
While precise figures are not available, estimates suggest that up to 50% or more of D.C.'s workforce is employed in roles directly or indirectly connected to politics and government. This suggests that a high percentage of residents are well-educated and have relatively high-paying jobs, which translates to better access to health care, and and other benefits not shared by many locations. And why did the other longevity trends occur? Life expectancy trends of this sort aren't very surprising when we consider that this study covered the 20th century, which included the dustbowl years, the Great Depression, massive population shifts from rural lifestyles to urban and industrialized lifestyles, and immense civil rights changes. In 1900, about 41% of the workforce was employed in agriculture. This reflects the rural, agrarian nature of American society at the time, with the majority of people living in rural areas and depending on farming for their livelihood. By 2000, that number had dropped to about 1.9% of the workforce. This dramatic decline reflects over a century of industrialization, urbanization, and technological advancement in farming, which allowed fewer people to produce more food. This shift represents one of the most profound transformations in American economic and social life over the 20th century. And last, but certainly not least: Disparities in infrastructure funding by the federal government date back to at least the Civil War. When the Civil War ended, it left behind an atmosphere of persistent government bias against the South that lingered well into the 20th century. While this lingering bias didn't have any effect on the findings of the longevity study mentioned in this article, it certainly explains some of the reasons why these health problems in the South persisted throughout the 20th century. And it's important to remember that this too was primarily the result of political effects. The Compromise of 1877: After the Civil War, the South faced widespread destruction, economic collapse, and institutional chaos. During reconstruction, federal investment in rebuilding was significant, but ended abruptly in 1877, largely due to Northern political fatigue and racial backlash, leading to a withdrawal of federal oversight and funding. The “Compromise of 1877” allowed Southern states to reinstate white-dominated governments, which reversed many of the gains made by Black citizens and slowed regional development. Institutional underdevelopment and racial segregation (Jim Crow laws) entrenched poverty, and limited educational and health infrastructure. New Deal programs of the 1930s didn't resolve uneven distribution problems. From the 1900s through the 1950s, federal investments in infrastructure, public health, and education were unevenly distributed, with Northern and Western states often receiving more funding per capita in key areas. Southern states often had weaker political representation in federal decision-making bodies, particularly for the poorest communities. New Deal programs in the 1930s technically applied nationwide, but in practice:
The long-term effect of the New Deal programs reinforced economic underdevelopment (especially in the South) and contributed to public health disparities, which are reflected in the longevity statistics. The post-World War II era saw more federal investment in Southern infrastructure (for example, interstate highways, and defense contracts), which helped drive economic growth in states like Texas and North Carolina. However, health and education funding often still lagged behind, particularly in rural and poor Southern areas. Southern states often maintained lower tax bases, which, of course, limited their ability to match or supplement federal funds. Many historians and policy scholars agree that historical regional funding disparities were not solely caused by post-Civil War bias, but it clearly had a persistent long-term effect, especially in some southern states. But the study's most important finding was: Life expectancy is not just about individual choices — it's profoundly shaped by where we live and the policies that govern our environment. States that adopted progressive public health strategies, like anti-smoking laws or Medicaid expansion, reaped the benefits in population longevity. Summarizing: This century long analysis offers a sobering view of how structural inequality has shaped, and continues to shape, health outcomes across the U.S. It also provides a compelling argument for the power of early investment in public health. For policymakers, the message is clear: where we’re born still largely determines how long we live, and that could surely be changed by the proper legislation. Reference: 1. Holford, T.R., McKay, L., Tam, J., Jeon, J., and Meza, R. (2025). All-Cause Mortality and Life Expectancy by Birth Cohort Across US States. JAMA Network Open, 8(4), e257695. Retrieved from https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2833159
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