It increased the size of the United States because it was based on the idea that America was destined by God to expand from the Atlantic to the Pacific, in other words, it encouraged many to expand west.
hope this helps i actually just learned about this in class :)
<span>Nationalism reject Foreign influences.</span>
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The role of government was that once the Roman empire established and made christianity the main religion of Rome, it esentially formalized the possibility of christians to take over the religious practice in this empire and gain increased power.