Is everyone in your vehicle an American citizen?

So I worked Monday, Tuesday, and Wednesday (and worked over 40 hours) so I took Thursday and Friday off. Thursday was jet skiing on the bay in Corpus. That night I stayed in corpus and we met up with some people. I met a girl that Lucas from Wyoming works with and we decided to go to South Padre Island together the next morning. So friday morning we were off for south texas. What do you eat when you are in southern texas? Hole in the wall mexican of course! We pulled into a little place and got some of the best mexican for SUPER cheap!!! The menu was in spanish and the waiter spoke little english but it was very good!!! We had these big burrito things... idk what they were but they werent called a burrito... So then we got to the island and it was gorgeous!!! Lots different than the beach in Corpus. Emily had never been jet skiing so I was down for doing it again. Then we spent the rest of the day just hanging out on the beach. No I haven't learned to surf yet :/ On our way back home... We came to a sign that said all cars must stop ahead. Border. Patrol. We being noobs decided to choose the shortest line. Being nervous as ever we pull up (and pry looked pretty suspicious) and the officer poked his head in the car, saw 2 girls, one with blonde hair and both with "colored" eyes, and asked "Is everyone in your vehicle an American citizen?" "Yes" "Ok have a good night"..... Didn't have to provide an ID or license or nothing. And that is how mexicans get into America. I could have easily fit 13 in my trunk. Not that I ever would but dang I could make easy money!!!!!