Answer:
Manifest destiny refers to the idea that persist in the nineteenth century United States of America has the universal objective of expanding through North America one day.
Step-by-step explanation:
People in favor of manifest destiny saw it as a way of promoting the glory of American capitalism and democracy.
Positive consequences
The problem of the explosion of the population of the U.S in the 19th century was tackled by westward expansion where surplus land and new opportunities helped them to prosper.
Negative consequences
The theory was used to justify the forced displacement of native Americans and other communities from their homes. The rapid growth of the United States also exacerbated the problem of slavery.