I was born in 1984 in the Philippines and adopted when I was 1 yr. old by US citizens. I came to the US with my adopted mother at the age of 2 with a Philippine passport. I had some stamps in it, but it was lost during a move over a decade ago. I applied for a US Passport, but I'm unsure about my citizenship. I'm told that I acquired citizenship through the CCA of 2000 under the conditions that one of my adopted parents is a US citizen, the adoption was full and final, and if I was admitted in the US as LPR. However, I'm not sure if I am a LPR because I don't have a green card. My mother didn't apply for one prior to coming to the States. I think my passport was stamped, but I can't verify if it was a I-551 stamp because I don't have it anymore. What should I do?