One major reason why New England <span>merchants became leading members of society is because of the immense profits they made through trade with other nations, primarily in Europe--since New England goods and ships were in high demand. </span>
The use of iron and steel is very much common in most of the infrastructure being built today. The new methods developed for the production of these essential metals have helped hasten and loosen the supply for the demand. By that, buildings have sufficient supply of these metals.
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Explanation:
The invention of the cotton gin was a revolution in the cotton industry. Due to the manner in which this sector was exploited in the US, it led to a large increase in slavery in the Southern states, in order to meet the constantly growing demand for cotton using a larger workforce.