The CP is key to U.S. power.
Joseph S. Nye 12, University Distinguished Service Professor, Emeritus and former Dean of the Harvard's Kennedy School of Government and inventor of the term “soft power”, 12-16-2012, "Immigration and American Power," https://www.belfercenter.org/publication/immigration-and-american-power
In addition, though studies suggest that the short-term economic benefits of immigration are relatively small, and that unskilled workers may suffer from competition, skilled immigrants can be important to particular sectors ― and to long-term growth. There is a strong correlation between the number of visas for skilled applicants and patents filed in the U.S. At the beginning of this century, Chinese- and Indian-born engineers were running one-quarter of Silicon Valley's technology businesses, which accounted for $17.8 billion in sales; and, in 2005, immigrants had helped to start one-quarter of all U.S. technology start-ups during the previous decade. Immigrants or children of immigrants founded roughly 40 percent of the 2010 Fortune 500 companies.
Equally important are immigration's benefits for America's soft power. The fact that people want to come to the U.S. enhances its appeal, and immigrants' upward mobility is attractive to people in other countries. The U.S. is a magnet, and many people can envisage themselves as Americans, in part because so many successful Americans look like them. Moreover, connections between immigrants and their families and friends back home help to convey accurate and positive information about the U.S.
Likewise, because the presence of many cultures creates avenues of connection with other countries, it helps to broaden Americans' attitudes and views of the world in an era of globalization. Rather than diluting hard and soft power, immigration enhances both.