Because you can be a naturalized citizen, not being born here but becoming a citizen later in life. My friend who works for the Passport agency processing applications to check for citizenship tells me there are several ways to be a citizen and not be born here. My aunt by marriage was born in Guatemala and married my uncle in 1955. After they were married a few years, she became a citizen through the naturalization process. She would not be eligible to be president.
Sorry, ma’am, but - Did you answer my question?