Between 1900 and 1930, the number of people who owned cars increased by. The largest increase in car ownership occurred between

The largest increase in car ownership occurred in 1980

Explanation:

The first automobile was first implemented in Germany and France back in the 1800s. Later America followed closely and dominated the market than the first countries. Henry invented the mass techniques, and they became standard and then named the company after him.

Because of the boom of automobiles, manufactures started production in other countries such as Europe so that they would meet the demand that had already risen in 1980. Thus, this made America a leading automobile maker.