How did Henry Ford affect the automobile industry? He made car production cheaper by improving the assembly line.
He made car production more expensive by making more luxury cars.
He made car production more expensive by mass-producing vehicles.
He made car production cheaper by using customized parts.

the answer is A

Explanation:

automobiles were very expensive because of their luxury and the parts that companies would use to make them. Henry Ford however found a few ways to make them cheaper, for example, he had mass-produced the vehicles, used handmade parts, and ASSEMBLY LINES to make things go faster.

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a.

congress passed laws allowing for free passage between states.