What was the main objective of those who believed in “Manifest Destiny?”

The main objective of those who believed in "Manifest Destiny" was to expand and spread American civilization and institutions across the North American continent, from the Atlantic to the Pacific Ocean. They believed that it was the destiny and right of the United States to control and settle the entire continent. This ideology motivated colonization, territorial acquisitions, and westward expansion in the 19th century, as they saw it as a means to spread democracy, Christianity, and American values.