If the United States and Cuba restore diplomatic ties in the coming weeks, as anticipated, the two countries will still be a long way from anything resembling a normal relationship, Cuban President Raul Castro has said repeatedly. His list of grievances is lengthy. But this week Castro said it boils down to two big issues. The first, of course, is the U.S. trade embargo. The other is the Guantanamo Bay Naval Station, the oldest overseas American navy base in the world, which the United States has occupied for 116 years.
http://www.washingtonpost.com/blogs/worldviews/wp/2015/05/15/why-the-u-s-base-at-cubas-guantanamo-bay-is-probably-doomed/