The US has been an established and time-tested platform for churning out businesses. All the reasons others have mentioned including culture, deregulation, etc

The US has been an established and time-tested platform for churning out businesses. All the reasons others have mentioned including culture, deregulation, etc may play a part but to me, it is the post-war head-start and momentum of continued success that has kept other countries from reigning supreme. Countries are constantly losing top talent to the U.S. because we have the money/opportunities to attract them and these countries lose out on any potential successes. Who knows, this could all change if it hasn't already.