ANSWER:
There are restrictions to traveling to Cuba because of failed "diplomatic relations" between "Cuba and the USA".
Step-by-step explanation:
- During 2016, American diplomats mysteriously fell ill in Cuba and President Trump accused Cuba of being responsible for the mysterious illness.
- Also, in 2018, Cuba was one of the few countries that supported Nicolas Maduro, the president of Venezuela while the US along with several other countries was trying to overthrow him.
- This led to tensions between Cuba and the U.S. and Trump restricted the travel to Cuba.