1. Because before WWII they(together with the UK) received with open arms the Jews that were expelled by Nazism and were half the Nobel prices in science. 2. B

1. Because before WWII they(together with the UK) received with open arms the Jews that were expelled by Nazism and were half the Nobel prices in science. 2. Because they won the WWII and took by force the best scientist in Germany that was the leader in the world in science and technology at the time. The other half was taken by the Soviet Union. The lingua franca in science was German, not English. 3.Because after the war, Europe was devastated and living conditions in the reconstruction were very poor(with things like having to work for free for the Government X hours a week) for scientists(and the rest of society) while crossing the Atlantic conditions were much better so the best scientist did. 4. Because after Breton Woods and Marshall's plan, the US became the hegemonic power in the world with the biggest market in the world and started transforming scientific ideas into products that generated wealth and became cheaper as they were mass produced. 5. Because they didn't have a socialistic economy like most of the world had and the best, most ambitious and brightest minds from socialistic countries fled there expecting to share some part of the wealth they created and have the freedom they lacked in their countries. Remember in the block countries being educated in the old bourgeois system,having accumulated wealth in the past or being son or grandson of one who had was a crime, making you a candidate for suspicion and prosecution (and eventual extermination). Stalin had a plan to exterminate all Jews in Russia(almost all revolutionaries like Lenin or Trotsky had Jewish origin), he did not complete his plan because he died before he could. It is incredible that making an analysis they could not see the most obvious and basic geopolitical events.