When the United States became a nation, it was done in the name of the most holy and undivided Trinity. The preamble to this Treat states it is based upon the Holy and undivided Trinity. The concept of the holy Trinity is unique to Christianity. This statement means the United States was founded on This is the oldest structure that you will find in America and it was built sometime between 1450 and 1000 BC by a Tiwa-speaking Native American tribe in New Mexico. The building of this house that features the red adobe brick and multiple stories is still the house of about 150 people. This is the oldest house in the United States.