What passageway was discovered that helped people move west, in the "how the west was won" movie?

there were three types of british colonies: royal, proprietary, and self-governing. each type had its own characteristics. proprietary colonies, such as pennsylvania, maryland, and delaware, were basically land grants from the british government.

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c.) the country needed a stronger central government.

i don't think it's c or d. i think it's either a or b.

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