O'Sullivan on Manifest Destiny in 1839 (Document A) stating "national birth was the beginning of a new history, the formation and progress of an untried political system, which separates us from the past and connects us with the future only we may confidently assume that our country is destined to be the great nation of futurity.... That is why they had no problem going to war with Mexico thus making it an important part of history when they were able to take more land and show aggressive imperialism which ended up hurting many individuals in the process. ... According to "The E...

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