If you can be arrested and tried in a US court, you are “subject to the jurisdiction”.
Subject to the jurisdiction refers to being directly from another country and having allegiance to that country. Meaning every Mexican who crosses the border and drops a kid on our side. The kid is still under the jurisdiction of Mexico.
The word jurisdiction in the 14th amendment has been .misinterpreted. The 14th amendment was written to cover slaves. It didn’t even cover native Americans much less a bunch of illegal aliens.