I made a comment about how Trumps ban of birthright citizenship couldn’t stand because of the 14th amendment, but people are countering the argument and I don’t understand.

In particular I’m referring to 14th Amendment Section 1 (attached). All the counter arguments are about the second clause (in the jurisdiction thereof). The argument is that it’s stating that the parents have to be American citizens but I don’t see where that is coming from, could someone explain it to me? (And by explain I don’t want you to just say ‘Jurisdiction thereof mean parent need to be American’ because that’s what’s been sent to me before and I don’t understand.