Its much easier to star a business in a homogeneous market like US. Where a culture is almost identical across each state. In contrast EU countries speak diffe

Its much easier to star a business in a homogeneous market like US. Where a culture is almost identical across each state. In contrast EU countries speak different languages and there are different cultural norms and habits. And while laws are similar there are differences between countries. I would say this is the biggest factor why us is the default unicorn location.