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Using longitudinal data linked to the 1850 and 1860 U.S. federal census manuscript schedules, this article examines the effect of migration to high-risk malaria counties on real estate wealth accumulation. Although the migrants recognized the risk of malaria, they still migrated to malarial regions. Those who migrated to areas with higher risk of malaria experienced smaller increases in real estate wealth than migrants to less malarial areas. The findings in this study provide historical evidence with which to estimate the potential modern-day economic benefit of malarial eradication.

This article uses nineteenth-century evidence to calculate the impact of early exposure to malaria-ridden environments on nutritional status and the immune system in America. I estimate the risk of contracting malarial fevers in the 1850s by using correlations between malaria and environmental factors such as climate and geographical features. The study demonstrates that Union Army recruits who spent their early years in malaria-endemic counties were 1.1 inches shorter at enlistment due to malnutrition and were 13 percent more susceptible to infections during the U.S. Civil War as a result of immune disorders than were those from malaria-free regions.

An important unknown in understanding the impact of climate change is the scope of adaptation, which requires observations on historical time scales. We consider how weather across U.S. history (1860–2000) has affected various measures of productivity. Using cross-sectional and panel methods, we document significant responses of agricultural and individual productivity to weather. We find strong effects of hotter and wetter weather early in U.S. history, but these effects have generally been attenuated in recent decades. The results suggest that estimates from a given period may be of limited use in forecasting the longer-term impacts of climate change.