Which new method used to manufacture steel in the late 1800s had a huge impact on the US because this method allowed for steel to be made much quicker in a lower cost

Bessemer

Explanation:

The Bessemer process was so fast (10–20 minutes for a heat) that it allowed little time for chemical analysis or adjustment of the alloying elements in the steel. Bessemer converters did not remove phosphorus efficiently from the molten steel; as low-phosphorus ores became more expensive, conversion costs increased.

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explanation:

a countries leader should be motivated by the common good of the country.