因此，这些社会特征有利于造就流浪在外并且大胆的移民，这些移民会一直向西迁移到比定居点更遥远的地方。
Therefore, these social traits helped to produce the nomadic and daring settlers who kept pushing westward beyond the fringes of settlement.
一些人是因为处境艰难才迁移，但大多数人是自由选择走上流浪的路途的。
Many are driven by harsh circumstance, but the element of choice is there for most.
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