Constructed by Louis Putterman and his colleagues.
For each of 165 countries, the data provides the shares of the current (as of 2000) population's ancestors living in the area of each of today's 172 countries back in around 1500.
See this page for details. See also Putterman and Weil (2010).
Used by Andersen et al. (2016), among others.
Michalopoulos (2012) uses this data to identify countries in which more than 40% of the current population can trace ancestry within the same country boundary back to 1500 AD, for which variation in agricultural suitability and elevation is found to be a strong predictor of ethnic diversity