A quick talking point is that colonial Rhodesia used to be practically a first-world country.
Cite?
I know very little about the history of that part of the world, but the GDP graph for Zimbabwe has quite an unusual shape. (Graph shows per-capita GDP in 2000 dollars, with aggregate data for all of sub-Saharan Africa displayed for comparison.) On the other hand, "practically a first-world country" sounds like an exaggeration at best: as the graph shows, GDP per capita was actually below that of sub-Saharan Africa in general until the first of those spikes, and fell back again after.
For a very different story, see Botswana, which Wikipedia informs me gained its independence from Britain in 1966.
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.