BEFORE WE START: Sectionalism has quite a few definitions. I don't know what it means, but I'm willing to do some research and provide you with the best definition.
DEFINE SECTIONALISM: →When you are loyal to someone's region or their section of a country (if they're not "over" an entire country). →"Undue concern with local interests or petty distinctions at the expense of general well-being" -Google
WHY TWO DEFINITIONS? This word could mean a few different things depending on how you use it, so I'm going to leave it up to you to find out which definition you want to use.
Confederate Army Under Robert E. Lee Wins Second Battle of Bull Run (Manassas) ... After Confederate artillery turned back a Union attack on Jackson's positions, Longstreet ordered his corps forward in an aggressive counterattack on the Union left, which had been weakened after Pope shifted his troops right to hit Jackson
