The project D. Building the Transcontinental I believe is the one that led to the creation of a system of time zones across America
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You did not provide the excerpt nor the answers so nobody can answer this.
I think it would probably be A. I looked it up and thats what it said
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One of them is the " nation was forced to give up its lands east of the Mississippi River and to migrate to an area in present-day Oklahoma. The Cherokee people called this journey the "Trail of Tears," because of its devastating effects."
I just had this question it took places over four day's
