The corniche road that circumnavigates the Cap Corse was only built in the mid 19th century, so it remained a place apart, accessible only from the sea. As a result, they were the only merchants and sailors on an island of mountain dwellers, and as they had no overland access to the rest of the island, when the agricultural economy declined (Phylloxera struck in 19th century) hundreds of Capicursini were forced to emigrate, many of them travelling to the Americas to seek their fortune in sugar, coffee or gold (a third of all Puerto Ricans are of Corsican descent, and a president of Venezuela was third generation Capicursini). These emigrants often returned once their fortune was made and built the fancy Tuscan style villas, Spanish haciendas or American colonial palazzi that can be seen in the villages along the cap.