December 22, 1895, the Puerto Rican Revolutionary Committee officially adopted a design which is today the official flag of Puerto Rico. In 1897, Antonio Mattei Lluberas, a wealthy coffee plantation owner from Yauco, visited the Puerto Rican Revolutionary Committee in New York City. There he met with Ramón Emeterio Betances, Juan de Mata Terreforte and Aurelio Méndez Martinez and together they proceeded to plan a major coup. The uprising, which became known as the Intentona de Yauco was to be directed by Betances, organized by Aurelio Mendez Mercado and the armed forces were to be commanded by General Juan Ríus Rivera from Cuba. The political immigration to New York practically came to a halt in 1898 after the Spanish–American War when Puerto Rico became a possession of the United States. It is estimated that 1,800 Puerto Rican citizens (they were not American citizens until 1917) had immigrated to New York during this period. World War I era In 1902, the United States Treasury Department issued new immigration guidelines that changed the status of all Puerto Ricans to "foreigners". Isabel Gonzalez was a young single mother who was expecting her second child. Her fiancé, who was in New York, sent for her with the intention of getting married. When Gonzalez arrived in New York, she and all the Puerto Ricans who were with her, were detained in Ellis Island and denied entry. She was accused of being an alien and as an unwed parent she was deemed as a burden to the welfare system of the country. Gonzalez challenged the Government of the United States in the groundbreaking case "GONZALES v. WILLIAMS' (her surname was misspelled by immigration officials). The Supreme Court ruled that under the immigration laws González was not an alien, and therefore could not be denied entry into New York. It also stated that Puerto Ricans were not U.S. citizens, they were "noncitizen nationals". Gonzalez, who became an activist on behalf of all Puerto Ricans, paved the way for the Jones–Shafroth Act, which conferred United States citizenship on all citizens of Puerto Rico. In 1917, the United States entered World War I and that same year the United States Congress approved the Jones–Shafroth Act which gave Puerto Ricans U.S. citizenship. Puerto Ricans no longer needed a passport to travel to the U.S. and were allowed to seek public office in the mainland U.S. The economic situation in the