what was the concept of manifest destiny
Newspaper editor John O'Sullivan coined the term Manifest Destiny in 1845 to describe the essence of this mindset, which was a rhetorical tone. It was used by Democrats in the 1840s to justify the war with Mexico and it was also used to divide half of Oregon with the United Kingdom.But Manifest Destiny always limped along because of its internal limitations and the issue of slavery, says Merk. It never became a national priority.t was used by Democrats in the 1840s to justify the war with Mexico and it was also used to divide half of Oregon with the United Kingdom. But Manifest Destiny always limped along because of its internal limitations and the issue of slavery, says Merk.