A 2014 study by professors Martin Gilens and Benjamin Page concluded that average American citizens have a near-zero, statistically non-significant impact on U.S. government policy
Testing Theories of American Politics: Elites, Interest Groups, and Average Citizens: https://www.cambridge.org/core/journals/perspectives-on-politics/article/testing-theories-of-american-politics-elites-interest-groups-and-average-citizens/62327F513959D0A304D4893B382B992B