because confederate forces were firing on union property in order to try and take it over.
here abraham lincoln made the emancipation proclomation.
and the proclamation freed the slaves in all states.
and it also held important supplies and weapons,ammo, this is part of the reason that the civil war happened. it also happened because Harriet Beecher Stowe, wrote a book called uncle toms cabin.it explained the lives of slaves
fort Sumter was in Confederate states but it was union property and Confederate troops started firing on fort Sumter and they fought for days and the union surrendered, suprisingly not a single man was killed