when was john o'sullivan born
John O'Sullivan was born in November, 1813. He became a journalist and was the founder and editor of the United States Magazine and Democratic Review (1837-1846).ver the following years the Manifest Destiny doctrine claimed that it should be the objective of the United States to absorb all of North America. This expansionism eventually ended in the acquisition of Texas, Oregon and California. In 1854 O'Sullivan became minister to Portugal.