Final answer:
After the United States acquired Spanish possessions post-1898, groups from the Philippines, Puerto Rico, and Guam became part of the US population. Puerto Ricans were granted US citizenship in 1917, while Filipinos faced immigration restrictions until after World War II.
Step-by-step explanation:
The group that came to the US after the country became an American possession in 1899 were primarily from the Philippines, Puerto Rico, and Guam, as these were Spanish possessions ceded to the United States following the Spanish-American War of 1898. The incorporation of Puerto Rico as a U.S. territory led to a significant increase in the Spanish-speaking population of the United States after the war. In 1917, the Jones Act granted U.S. citizenship to Puerto Ricans, further integrating this community into the American population. Filipinos, on the other hand, faced restrictive immigration quotas despite their country being under U.S. control until its independence was recognized after World War II.