This question will probably not be answered without additional data but maybe you can steer me right. I just want to satisfy my curiosity.
Background: we’re from the Philippines. Our maternal grandfather went to the US for his college studies. He went to the US in the 1920s and obtained a degree from U of Washington (or Washington State, can’t recall.) The Philippines was then a protectorate of the US, part of the commonwealth, until it gained independence in 1946.
Grandpa came home immediately after graduation, married and settled down. He died in 1976.
Segui to 2012. During our mother’s 85th birthday celebration, our sister made a ppt presentation. She showed scanned documents which she obtained and paid for online (including verification.) One doc showed that our grandfather took the oath of allegiance (to the flag??) Another doc showed his college records and clearance, and another showed his signature in the ship’s manifest. They all jived.
So does that make him a US citizen? I’m sure he kept his Filipino citizenship because he was an ardent voter here. A dual citizenship therefore? He never told anyone about taking the oath.