How come the vast majority of popular software programs/websites come from the USA?

[Cortez]

This is an honest question. Why are Europeans and Asians so worthless when it comes to advancing computer technology? They are rich regions so why don't they contribute the same as America does? Despite their larger population they do not innovate that much. Yet the smaller USA innovates a lot. Why?

Almost all of the globally popular websites (Google, Youtube, Facebook, Twitter, Wikipedia, Yahoo, Amazon, Groupon, Tumblr, Pinterest, Reddit, Craigslist, LinkedIn, Instagram, etc) come from America

Almost all of the globally popular operating systems (Mac, Microsoft, Unix, Oracle, Android, iOS, etc) come from America

Almost all of the globally popular web browsers (IE, Firefox, Chrome, Safari, etc) come from America.

Almost all of the popular software applications (BitTorrent, Wordpress, Adobe Flash Player, Photoshop, Norton Anti-Virus, etc) come from America
@ Scary. That doesn't make any sense. All of this software was developed by Americans or people who have lived in America since they were kids (i.e. like Sergey Brin of Google). They didn't build their programs in America because of the pay. They built their programs in America because that's where they live. Why don't Europeans and Asians build as many software programs as Americans?