Final answer:
Manifest Destiny is a 19th-century doctrine suggesting that the expansion of the US across the American continents was justified and inevitable, which meant American settlers were destined to move westward to the Pacific Ocean.
Step-by-step explanation:
The concept of Manifest Destiny refers to the 19th-century doctrine or belief that the expansion of the US throughout the American continents was both justified and inevitable. Under the concept of Manifest Destiny, it was providential that American settlers moved westward to the Pacific Ocean.
This expansionist impulse was grounded in the belief that Americans were destined to spread democratic institutions and American values "from sea to shining sea." This movement included the notion that new territories and people, such as the Native Americans and Mexicans, were to be Americanized and that this expansion was tantamount to spreading freedom.
Therefore, the correct answer is that Manifest Destiny means it was providential that American settlers moved westward to the Pacific Ocean.