The current study attempts to examine the sentiments of liberal cosmopolitanism in the United States in recent decades and fill the gaps in the literature in three ways. First, we propose a new multidimensional measure of cosmopolitanism relying on the data from the World Values Surveys; second, we try to see whether there is a trend toward being more or less cosmopolitan in the USA from 1982 to 2017; and third, we explore whether there exist age-related variations in public attitudes. The results lend credence to our hypotheses: (1) The overall support for cosmopolitanism has been on the rise ‒ even in the new century under a shifted political atmosphere. (2) The age-related differences in support for cosmopolitanism has become wider over the last four decades.