[knowitall]

"more than 8 in 10 open source developers are white"

According to Wikipedia 72% of the population of the USA are white, so maybe 8 in 10 is not really that much of an indication of discrimination or disadvantage. (72% boils down to "more than 7 in 10").

[theorique]

While OSS is not 'just' a US thing, it is probably heavily weighted toward US participation. Although India and China have huge populations of technically educated people, the language barrier is probably a factor there.

I would imagine that the region with next highest contribution is Europe, which comprehensive English teaching. (also: mostly white)