Puerto Rico, an archipelago that includes the main island of Puerto Rico and a number of smaller islands, is an unincorporated territory of the United States, located in the northeastern Caribbean Sea. The capital and most populous city is San Juan, the second oldest European-established capital city in the Americas, after Santo Domingo (Dominican Republic), founded by Spanish colonists in 1521. Its official languages are Spanish, which is predominant, and English. The island's population is approximately 3.5 million.
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