Generating the Wealth of Nations 27: Brazil and Colombia
When I finished my discussion of Argentina, Brazil, Chile, and Mexico. I noticed that Brazil and Columbia began the 20th century with nearly identical real GDP per capita...and wound up, in 2010, with nearly identical real GDP per capita. The paths aren't all that different, either (Colombia grew a little faster early, and Brazil grew a little faster later). If anyone is more familiar with what has been happening in these two countries than I am (that would include almost everyone, I would guess), have at it.
Data from the Maddison Project.