Well Alexander was the first leader to use the technique of colonization, creating new cities based on Greek ideals in conquered lands. He also brought armies to engineers, architects, scientists, and philosophers, effectively spreading Greek culture across the world. And the main reason he was called great was because of his many conquests, for example: He crossed (334) the Hellespont (now the Dardanelles) and, as head of an allied Greek army, undertook the war on Persia that his father had been planning.
The answer is (D), all of the above.
Earlier, people lived in cramped spaces, so the prospect of land in the west was appealing to them.
The discovery of gold in California resulted in a lot of settlers moving west, as well, to search for a fortune.
Finally, many traveled west to start a new life out in the spaces where no one had claimed anything yet.
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<u><em>To me, this is super cute. I think this is perfect! </em></u>
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<em>Who is this Alex person :3</em>