One of the largest hurdles for people wanting to live in a Tiny House is access to land. Land is expensive, in growing short supply and people want a balance of having land and being close to city or town centers where they can access services, entertainment and employment.
This page describes the most common path to U.S. citizenship, which allows a green card holder (permanent resident) of at least 5 years to apply for naturalization. Other paths include:
The alien and sedition acts stated that the period to become a  citizen was extended to 14 years. Initially, it only took 5 years  for one to become a citizen.