Brain drain of the past century

Until recently the world experienced a brain drain because all the best people of the world came to America and contributed to the development of this country. Except for Germany and hence it was the only happening country apart from America for a long time. Even England suffered major brain drain. In recent years because of the economic downturn many people have returned home or gone to other countries. And that is why we see sparks of development in all fields around the globe.