What impact did new technologies in the assembly and manufacturing have on the auto industry in the 1920s

It had a very positive impact because the 1920's was when many new technologies were introduced, one example being the the assembly line, which made many industries more productive and profitable.

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Car production increased rapidly.

Explanation:

Henry Ford wanted to build both sturdy and cheap cars for the multitudes, and the assembly line method of production allowed him to improve his profit margin and reduce both the time of production and the cost of the vehicle to buyers. That´s how the Ford Model T became the best-selling vehicle of all time (until 1972), was the first car to reach a million sells and, by then, it accounted for half of all the cars in the world.

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