Where does O'Sullivan suggest the United States should expand after Texas? Why?

1. Oregon

2. To spread Republican Democracy throughout North America

Explanation:

John Louis O'Sullivan who lived between 1813 to 1895, was once a US Minister to Portugal, and primarily an American columnist and editor, who was famous for his "manifest destiny" slogan in 1845, for the purpose of advocating for the expansion of Uinted States to Texas and later the Oregon Country.

In his attempts to justify his claim, he stated that, the manifest destiny of the United States, is to overspread the continent allotted by Providence or God for the free development of yearly multiplication into millions in population.