When we sing "My country tis of thee." Who is "Thee?"
It's God, right?
As a nation. As Christians. We believe that the United States of America exists because of God's blessing.
Why do we believe that God willed, sanctioned, even led 500 years of discovery, colonization, genocide, slavery, boarding schools, broken treaties, sexism, segregation and nuclear warfare?
It's because of some Papal Bulls that were written in the 15th century known as the doctrine of discovery. At the most basic level, the Doctrine of Discovery is the Church in Europe saying to the nations of Europe, "Whatever lands you encounter that are not ruled by Christian rulers, those people are less than human and the land is yours for the taking." It was the Doctrine of Discovery that allowed Christopher Columbus to get lost at sea, land on a continent inhabited by millions, and claim to have discovered it.