Consider this:
Master of the Island
Which country is the best colonizer?
By Joel Waldfogel
http://www.slate.com/id/2151852/
"...In new research, James Feyrer and Bruce Sacerdote, both of Dartmouth College, consider the effect of a particular aspect of history—the length of European colonization—on the current standard of living of a group of 80 tiny, isolated islands that have not previously been used in cross-country comparisons. Their question: Are the islands that experienced European colonization for a longer period of time richer today?...
...Feyrer and Sacedote's key findings are that the longer one of the islands spent as a colony, the higher its present-day living standards and the lower its infant mortality rate. Each additional century of European colonization is associated with a 40 percent boost in income today and a reduction in infant mortality of 2.6 deaths per 1,000 births...
...The authors also compare the experiences of separate Pacific islands with eight different colonizers: the United States, Britain, Spain, the Netherlands, Portugal, Japan, Germany, and France. Their verdict is that the islands that are best off, in terms of income growth, are the ones that were colonized by the United States—as in Guam and Puerto Rico. Next best is time spent as a Dutch, British, or French colony. At the bottom are the countries colonized by the Spanish and especially the Portuguese..."