My dear friends, since humans were created they were free to travel how they saw fit. Likewise, Americans have shared in that same right since the dawn of our beautiful country. Americans have always had the right to travel freely and unencumbered from laws, regulations, statues, and licensing.

HISTORY
From the use of horse and buggy, to the early Model 'T', Americans have never been required to get "permission" to travel on the public roads or highways when it was for personal reasons. Has anything changed now that you have zippy fast cars?

Soon there were a lot of people on the roads for commercial purposes. This resulted in people lumbering along transporting generous loads on the roads with trucks and trailers, because of this the government felt the need to make laws and regulations to protect the innocent citizens from the dangers of this commercial traffic.

Following this, the government began requiring commercial drivers to register and obtain "licenses", basically this meant they were getting permission from the government for use on the public roads and highways for commercial use.

This lead to a creative revenue stream requiring a registration to be paid by these divers for their vehicles to subsidize the extra wear and tear on the public highways.
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My car is NOT a "Motor Vehicle"

USC Title 18, § 31 9(6) - Definition of "Motor Vehicle":
"The term "motor vehicle" means every description of carriage or other contrivance propelled or drawn by mechanical power and used for commercial purposes on the highways in the transportation of passengers and property, or property or cargo."
USC Title 18, § 31(10) - Definition of "Commercial Purposes":
"The term "used for commercial purposes" means the carriage of the persons or property for any fare, fee, rate, charge or other consideration, or directly or indirectly in connection with any business, or other undertaking for profit."