U.S. factory owners and employment agencies had begun recruiting heavily on Puerto Rico.
After 1945, economic changes transformed Puerto Rico's economy from a monocultural plantation economy into a platform for export-production in factories through what was called Operation Bootstrap. By the 1950s a growing unemployment problem left thousands of Puerto Ricans in need of a fresh start on American companies.
They were able to grow their own food which was a plus for them since the rainfall helped increase their chances of getting food. Hopefully, this helps you. ^^