By one estimate, foreign STEM workers immigrating to the United States accounted for between 30 to 50 percent of all U.S. productivity growth between 1990 and 2010. These international STEM workers came to the United States to study, research, and collaborate with native-born scientists; they invested their skills in growing the U.S. economy. But despite what the xenophobes in the administration claim, international students aren’t stealing American students’ slots. To the contrary: their tuition dollars enable more American students to attend college. That’s because international students are more likely to pay full freight, and so they end up cross-subsidizing the tuition charged to U.S.-citizen undergrads.