Ground sloth
The last surviving ground sloths lived in the Caribbean Antilles.  Megalocnus may have survived until about the third century BC in Cuba. By then ground sloths had been extinct on the mainland of North and South America for 10,000 years or more. They survived on Caribbean islands because humans got to the islands much later.  Some island sloth populations lived 5,000-6,000 years later than their continental mainland relatives.  This fits the pattern of Holocene extinction of large vertebrates due to human dispersal.  In other words, they were probably hunted or otherwise so affected by humans that they were unable to survive.