For example, in the Shanghai ranking, 16 of the top 20 universities are in the USA. https://www.shanghairanking.com/rankings/arwu/2024
In US News and World reports of top universities, 14 of the top 20 universities in the world are in the USA. https://www.usnews.com/education/best-global-universities/ra...
In The Times Higher Education ranking, 13 of the top 20 universities in the world are in the USA. https://www.timeshighereducation.com/world-university-rankin...
To be blunt, your assertion has extremely weak evidence. I urge you to look at facts and evidence and not your feels.