What does john o'sullivan mean when he says natural birth

He means that our national birth was the beginning of a new history, the formation and progress of a political system and not tried that it separates us from the past and it only connects us with the future; and till now as you greet the whole development of the natural rights of man, in the moral life, politics, and national that we can confidently suppose that our country is destined for being the great nation of future

Explanation:

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

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