Answer:
The death of Elijah Lovejoy in 1837 convinced many northerners that slavery was incompatible with white Americans' liberties.
Explanation:
Elijah Parish Lovejoy was an American journalist and abolitionist who was killed in Alton, Illinois, for attempting to defend his press against rioters in favor of slavery.
On three occasions, the presses used by Lovejoy had been destroyed by rioters. Refugee in his printing press, he tried this time to resist, weapon in hand. The rioters managed to fire the building, however, before shooting at Lovejoy as it fled the burning building. His death sparked a national controversy between abolitionists and anti-abolitionists. Attorney Wendell Phillips defended the printer in a speech delivered at Faneuil Hall in Boston on December 8, 1837, elevating him to the rank of champion of the freedom of press.