13. After Castro's visit what happens to make relations warmer between the U.S. and Cuba?

fter Fidel Castro's visit to the United States in 2009, relations between the U.S. and Cuba began to warm up. This was marked by the restoration of diplomatic relations in 2015, which included the reopening of embassies in both countries and the resumption of direct commercial flights. Additionally, the two countries began to engage in diplomatic and economic negotiations, leading to the easing of travel and trade restrictions.