Read the following passage and answer the question that follows.

Of the six American winners of science Nobels this year, three were born outside the United States. In this century, the émigré fraction of U.S. Nobels in physics, chemistry and medicine now stands at 40 percent.

The nation’s long history of scientific feats, exemplified by Nobels, helped build a number of trillion-dollar companies in Silicon Valley as well as the world’s most dynamic economy and its wealth of social benefits, economists say.

Which of the following can be BEST concluded from the above passage?