English Puerto Rico

i got back from Puerto Rico on Friday so i thought i'd run a cool POD i picked up while there, in 1598 George Clifford, 3rd Earl of Cumberland took over the island and held in for a several months, they left because of an dysentery outbreak, but what if no outbreak had happened? could the English held on to the island long term?
 
If England take Puerto Rico i believe the rest of the spanish colonies in America will be doomed,that why the spaniard built the castle of San Cristobal and El Morro and walled the city of San Juan.
 
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