Treaty of Paris was entered into on 10 December 1898

The Treaty of Paris was entered into on 10 December 1898 between Spain and the United States.²¹ Under Article IX of the treaty, the civil rights and political status of the native inhabitants of the territories ceded to the United States would be determined by its Congress -

"Spanish subjects, natives of the Peninsula, residing in the territory over which Spain by the present treaty relinquishes or cedes her sovereignty may remain in such territory or may remove therefrom, retaining in either event all their rights of property, including the right to sell or dispose of such property or of its proceeds; and they shall also have the right to carry on their industry, commerce, and professions, being subject in respect thereof to such laws as are applicable to foreigners. In case they remain in the territory they may preserve their allegiance to the Crown of Spain by making, before a court of record, within a year from the date of the exchange of ratifications of this treaty, a declaration of their decision to preserve such allegiance; in default of which declaration they shall be held to have renounced it and to have adopted the nationality of the territory in which they reside.

Thus –

"The civil rights and political status of the native inhabitants of the territories hereby ceded to the United States shall be determined by the Congress."²²