I think a big reason America dominates is having a country with hundreds of millions of people speaking the same language on a massive, resource-rich continent.

I think a big reason America dominates is having a country with hundreds of millions of people speaking the same language on a massive, resource-rich continent. If a competitor to Facebook started at the same time in Switzerland, Facebook would have spread dozens of times faster in the states, then given that the internet is global, the network effect would see it defeat competitors one by one. (You could argue, also, that the immigration situation leads to the US' success, a big chunk of the world's best and brightest migrate to the US. From CNBC: Apple founder Steve Jobs is the son of a Syrian immigrant, Amazon CEO Jeff Bezos is a second generation Cuban immigrant, Google founder Sergey Brin was born in Russia, and Facebook co-founder Eduardo Saverin is a Brazilian native.) I think the VC situation is the other big reason American tech dominates. I don't know enough about how that all works too know why the US succeeds there, but I understand other countries don't have anywhere near the same amount of VC money