All inhabitants continuing to reside in Puerto Rico who were Spanish subjects on the 11th day of April 1899, and then resided in Puerto Rico, and their children born subsequent thereto, shall be deemed and held to be citizens of Puerto Rico, and as such entitled to the protection of the United States, except such as shall have elected to preserve their allegiance to the Crown of Spain on or before the 11th day of April 1900, in accordance with the provisions of the treaty of peace between the United States and Spain entered into on the 11th day of April 1899; and they, together with such citizens of the United States as may reside in Puerto Rico, shall constitute a body politic under the name of the People of Puerto Rico, with governmental powers as hereinafter conferred, and with power to sue and be sued as such.