Changes

To check the robustness of their results, the authors run specification (2) with a number of additional covariates.

#Add covariate for Protestant Country interacted with year dummies -- either insignificant or marginally significant.

#Add average number of years at war variable as many social-scientists via war as an important factor in state building.

#Add dummy for Roman heritage. As many view roots from the roman empire as significant determinant of rise of europe

#Add interactions between distance from the equator and dates. This is to rule out alternative explanation that economic activity was simply shifting away from the south of Europe and towards the north Atlantic states anyways.