That is because Ravenna was a city that was reconquered by the Byzantine empire after it originally fell to the Ostrogoth when the fall of the Western Roman Empire occurred. It was a capital for western Romans and for the Ostrogoth, but it wasn't for the Byzantine people who had their own capitol even after they reconquered it.
The Platt Amendment explained the following: 1. Cuba could not make any treaty with another nation that would weaken its independence or allow another foreign power to gain territory in Cuba. 2. Cuba had to allow the US to buy or lease naval stations in Cuba. 3.