The correct answer is it increased tensions about slavery across the United States.
John Brown was an avid abolitionist who believed that the only way to get rid of slavery within the United States was to start a violent rebellion. This is why Brown gathered his supporters in order to lead an attack on a federal arsenal. From there, Brown and his supporters would take those weapons, give them to slaves, and start a violent rebellion which was supposed to end slavery in the United States. Brown's plan failed and this only lead to increased tensions between Northerners and Southerners.