Over the years numerous unsuccessful attempts were made by the French

Over the years numerous unsuccessful attempts were made by the French, Dutch, and English to conquer the island. To guard against these incursions, the Spanish constructed the many forts and ramparts still found on the island. Puerto Rico remained an overseas province of Spain until the Spanish-American war, when U.S. forces invaded the island with a landing at Guánica. Under the Treaty of Paris of 1898, Spain ceded Puerto Rico (along with Cuba, the Philippines and Guam) to the U.S. As a result, the turn of the century saw Puerto Rico under United States sovereignty. At that time, Puerto Rico’s economy relied on its sugar crop, but by the middle of the century, an ambitious industrialization effort, called Operation Bootstrap, was underway. Cheap labor and attractive tax laws attracted American companies, and soon the Puerto Rican economy was firmly grounded in manufacturing and tourism. Today, Puerto Rico is a leading tourist destination and manufacturing center; the island produces high-tech equipment and many top-selling American pharmaceuticals.