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:
You can apply for citizenship 3 months before your 5th year of living in the US. If you have been out of the US for long periods of time (more than 3-6 months), then you may have to wait until you have been in US for 5 continous years. If you are married to a US citizen, you can apply after 3 years residence.