1) What makes you think it hasn't been a problem?
- China nationals have been caught doing it.
- Talk to any junior State Department employee sent to embassies overseas; they will tell you it is a big deal.

2) International air travel is a major catalyst.

3) The Biden Administration allowing millions of people in. Many crossing the Rio Grande are not from Latin America, by the way. ~3M citizens have been created by birthright citizenship and loose border policies. This is why most countries don't have birthright citizenship.

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Now, a question for you: Why is it important to you (as a policy matter, not as a constitutional issue) for the US to have birthright citizenship?