Answer:
the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable.
Explanation:
The idea of manifest destiny gained popularity in the mid-19th century and was built upon the notion of freedom. Advocates for manifest destiny believed that Americans were free, even bound by fate, to conquer the North American continent and expand the realm of democratic republicanism and Christianity.
There are three basic themes to manifest destiny: The special virtues of the American people and their institutions. The mission of the United States to redeem and remake the west in the image of the agrarian East. An irresistible destiny to accomplish this essential duty.
The transcontinental railroad helped manifest destiny by making it easier to transport supplies and people.
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