Study: Percentage of European ancestry predicts a country's GDP and the quality of its institutions (Source).

"Institutional Quality is the only strongly supported direct predictor of GDP out of the factors considered in these analyses."

"In our analyses institutional quality is linked to several different predictors (i.e. In-group bias, State History, European Ancestry, Latitude, and Timing of Agricultural Transition)"

"countries with substantial European-descendant populations have inherited cultural traits from their European ancestors [...] which are associated with institutional quality"

The authors state that lower in-group bias predicts "more effective institutional performance" but also point out that "lower-levels of in-group bias [...] itself appears related to the proportion of a nation’s population that descends from European countries."

(Post continued here).