What other industries benefited from the automobile industry?

Henry Ford was a famous american automobile manufacturer. he introduced the assembly line. what is an assembly?

How did the assembly line affect price?

The Assembly line reduced time to produce a car, prices were lowered since manufacturing multiple parts that were interchangeably greatly profited from that venture as increasing production of all the goods like the petroleum industry, manufacturing industry and selling and distribution of said materials and resources now were easier. if Henry Ford had not invented the model t we would not have the Hoover Dam it needed tons of concrete and mater to be brought there fast as possible.