Answer:
1998
Explanation:
In 1998 in Puerto Rico, to be more specific December 13th, the population was called to vote in a referendum to check how they felt about the politic relationship that they had with the United States, and their status of protectorate, the result of the referendum was non of the above, the question was how they´d felt more comfortable with the situation between Puerto Rico and USA, the options were:
State
Associate State
Independence
Free association
None of the above.
