All aliens are here under reciprocal agreements (treaties) between their countries and the US government, as to how they will be treated, but they are never subject to the jurisdiction of the US Constitution.<quoted text>
Answer: "and subject to the jurisdiction" simply means having to obey US laws. Foreign diplomats are not "subject to the jurisdiction" because they do not have to obey US laws. Everyone else who is in the USA is "subject to the jurisdiction."
The idea that a foreign tourist in the USA is not "subject to the jurisdiction" of the USA and hence does not have to obey US law is nutty.
On October 1, the US Supreme Court turned down two birther appeals of one of the TEN cases that had all ruled that Obama and McCain are Natural Born Citizens due simply to their place of birth, on US soil, the Farrar case in Georgia, which had ruled that "children born within the United States are natural born citizens, regardless of the citizenship of their parents." By rejecting the appeal, the US Supreme Court allowed the ruling of the lower court to STAND.
This is what it takes to be subject to the Constitution, try getting an alien to comply.
I hereby declare, on oath, that I absolutely and entirely renounce and abjure all allegiance and fidelity to any foreign prince, potentate, state, or sovereignty of whom or which I have heretofore been a subject or citizen; that I will support and defend the Constitution and laws of the United States of America against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will bear arms on behalf of the United States when required by the law; that I will perform noncombatant service in the Armed Forces of the United States when required by the law; that I will perform work of national importance under civilian direction when required by the law; and that I take this obligation freely without any mental reservation or purpose of evasion; so help me God.