You are asking about one fifth of the world's population and thousands of years of history. North and South America are separated by ninety miles of impassable mud, which has blocked all interactions to the present day. So you need to narrow your question a lot.
They were not separated from civilizations' governments
American Classical Orchestra was created in 1985.
American Classical League was created in 1919.
The motto of American Classical League is 'Riverbend Certamen'.
Encyclopedia of American Religions was created in 1987.
The ISBN of Encyclopedia of American Religions is 978-0787696962.
Encyclopedia of American Religions has 1386 pages.
Classical prophets are figures from major world religions like Judaism, Christianity, and Islam, such as Moses, Isaiah, Jesus, and Muhammad. Non-classical prophets can refer to individuals from diverse belief systems or spiritual traditions outside of the main Abrahamic religions, like Native American shamans, Hindu gurus, or New Age channelers. The distinction between classical and non-classical prophets often lies in the traditions, teachings, and cultural contexts within which these figures emerge.
American School of Classical Studies at Athens was created in 1881.
American Classical League's motto is 'Vestra Causa Tota Nostra Est'.
the American revolution
Belief in a creator.hope That could help.