sort of is more correct.
since July 25 1950 Puerto Rico is what is known as a "free associated state" which means that the door is open for them to be independent anytime they wish - Puerto Ricans pay no Federal Income Tax (they fill out the same forms but the bucks stay in PR). They cannot vote in US elections, but they are US citizens and have honorably and ably served in the US Armed Forces since 1898.
“but they are US citizens and have honorably and ably served in the US Armed Forces since 1898”
Thank you for noting that.