So your original comment was somewhat of a tangent. the point jedberg made is that it is in the interest of a country with a strong economic and academic base to welcome the smartest people from across the world, since it is unlikely that all the smartest people in the world are in the US.

Yes, but Jedberg makes it sound as though -- given that only a small fraction of the world's population lives in the USA -- the country has little chance of succeeding if it is to go without immigrants. I disagree, and an extreme example I could offer as a counterpoint is Japan: tiny population (relatively), yet outsized performance.