Final answer:
The United States imperialized Puerto Rico through the Treaty of Paris in 1898. Puerto Rico became a U.S. territory with its own government structure but without the same rights as other territories.
Step-by-step explanation:
The United States imperialized Puerto Rico through the Treaty of Paris in 1898, which ended the Spanish-American War. Under the Foraker Act of 1900, the United States established control over Puerto Rico and implemented a government structure with democratically elected delegates. However, Puerto Rico was considered an insular area and its inhabitants did not have the same rights of U.S. citizenship as other territories. Puerto Rico remains a U.S. territory today.