Question: When did puerto become part of the usa?
Disambiguated questions and answers: question: When did puerto become part of the usa due to the Treaty of Paris of 1898 coming into effect?
When did puerto become part of the usa due to the Treaty of Paris of 1898 being signed?
answer: April 11, 1899
10 December 1898
Natural Questions answer: 1917 (from the Wikipedia article "Puerto Rico")