Answer:
nationalism is pretty much going with the flow or majority. identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations.
and then sectionalism is like when you are just in favor of one half of your country instead of all of it. restriction of interest to a narrow sphere; undue concern with local interests or petty distinctions at the expense of general well-being.
An example would be:
if half of the country wants free ice cream for dinner, and half of the country wants free brownies for lunch, a nationalist would pick what most of the nation wanted, but a sectionalist would pick what his side of the nation wanted. Hope this helps you and pls mark me brainliest.
