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To my knowledge, the correct answer among all of the given choices is C.) Steam. If I'm not mistaken, this was the time that more trains came into use.
I hope this is the answer you were looking for and that it helps!! :)
The Constitution stands as a turning point in United States history and in world history. ... The result of months of meetings, debates, drafting and redrafting was the Constitution of the United States of America, the oldest charter of supreme law in continuous use.
