Answer:
D. air brakes is the correct answer.
Explanation:
Steel was important to industrial growth after the civil war because it was used to make steel rails for railroads. <span>n the years between the </span>American Civil War<span> and the end of the nineteenth century the modern U.S. industrial economy developed on the backbone of a good transportation infrastructure mainly railroads that were developed from steel.</span><span>
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Christianity.
This is shown when he conquers the Saxons of the North, he had convert them to Christianity. This is further proven as he encouraged church-based education. Thus, overall, showing that he spread Christianity to lands that he conquered.
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