What was an argument used by john l. o'sullivan to explain the idea of manifest destiny? a. the united states had a responsibility to come to the aid of the nations who first explored and colonized its land. b. the united states needed to make sure that it only let in people who shared its values. c. the united states was unique in the world as a democracy of people from many different nations. d. the united states was at a unique point where it had to be careful of great and rapid change.

The correct answer is C) The United States was unique in the world as a democracy of people from many different nations.

An argument used by John L. O'Sullivan to explain the idea of Manifest Destiny was that the United States was unique in the world as a democracy of people from many different nations.

John L. O'Sullivan (1813-1895) was an American Journalist that coined the term "Manifested Destiny" in 1845. He was writing a column when he applied the term when he was referring to the annexation of the Oregon county and the Texas territory to the US. He published his essay called "Annexation" in the newspaper called "Democratic Review." An argument used by John L. O'Sullivan to explain the idea of Manifest Destiny was that the United States was unique in the world as a democracy of people from many different nations.

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