How was the idea of manifest destiny brought about by nationalism

Manifest destiny is the idea that Americans should explore from the Atlantic Ocean to the Pacific Ocean. ... Western expansion impacted the growth of nationalism by promoting the idea of the hardy pioneer as the iconic American and the common man as the embodiment of democracy.

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explanation: i just want to

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.