Expansionists justified the idea of manifest destiny and the acquisition of new territory because they were spreading what
a . catholicism
b . democracy
c . slavery
d . individualism

Expansionists justified the idea of Manifest Destiny and the acquisition of new territory because they were spreading B) Democracy. Those that supported Manifest Destiny believed that the United States' unique cultural and political traits had destined it for expansion and that this was supported by its higher ideals that had to be spread across the continent.