“…Because the city fixed effects will remove any time-invariant geographical controls, we follow the same procedure as in several studies where time-varying historical control variables are difficult to obtain (e.g. Juhász (2018) and Waldinger (2022)) and interact our controls 𝑥 𝑖,0 with the year fixed effects. The baseline controls we include in 𝑥 𝑖,0 are latitude, longitude, log distance to river, log distance to coast, ruggedness, malaria, altitude, precipitation, temperature, and suitability for dryland rice, wetland rice, wheat, and cotton.…”