Answer:
A guardian angel is an angel that is assigned to protect and guide a particular person, group, kingdom, or country. Belief in guardian angels can be traced throughout all antiquity. Sometimes they'll get in contact with you but most of the time they guide as an unseen hand.
Knights of Saint John of Jerusalem
I think he is reminding the American people that our
ancestors fought hard to establish this country. He tells that we should proud of who we are
and where we come from and we should always defend the ideals of democracy both
here and abroad.