The difference between nationalism and sectionalism is that nationalism being loyal to the entire country while sectionalism is being loyal to only a part of the country.
Nationalism is also known as loyalty to ones country. It means identifying with one's nation and being supportive of its interest over that of other countries.
Sectionalism on the other hand means being loyal to only particular parts of the country instead of the whole country. Having only the interests of ones region at heart.
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