Sanctions against Cuba likely continue because those sanctions are popular with an influential demographic in a swing state, namely Cuban Americans in Florida. In 2020, 58% of Cuban Americans affiliated with the GOP, while only 32% of non-Cuban Hispanics did. Furthermore, Cuban Americans have high voter turnout relative to other Hispanic demographics in America.

https://www.pewresearch.org/fact-tank/2020/10/02/most-cuban-...