What could have been a source of income for Puerto Rico in the past is:
Sugar production in Puerto Rico.
Since the 16th century, the production of sugar at an industrial level was one of the economic pillars of Puerto Rico, in the year 1523 the first sugar mill called San Juan de las Palmas was established, having great prosperity in including new technologies as the decades.
However, from the mid-twentieth century, the sugar mills were relegated by other economic processes until in 2000 the last calls for the Roig mill in Yabucoa and the Coloso mill were closed.
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