John L. O'Sullivan
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acquisition of the Mexican Cession
O'Sullivan used the term Manifest Destiny in advocating for the US to annex Texas and the Oregon Country, which were not part of the USA at the time. John O'Sullivan wrote about Manifest Destiny starting in 1845.
John Louis O'Sullivan wrote manifest destiny in 1845 as a way of promoting the annexation of Texas and Oregon Country.
O'Sullivan used the term Manifest Destiny in advocating for the US to annex Texas and the Oregon Country, which were not part of the USA at the time. John O'Sullivan wrote about Manifest Destiny starting in 1845.
John L O' Sullivan
The term Manifest Destiny was first used to support westward expansion to the Pacific Ocean. Manifest Destiny was a popular concept in 19th century America.
The idea of Manifest Destiny grew popular.
John O'Sullivan.
John L. O'Sullivan
Yes he did he was a good supporter.