Final answer:
President Pierce's administration enforced the Fugitive Slave Act in the case of Anthony Burns, resulting in his arrest and return to Virginia. Mass demonstrations and a confrontation at the courthouse took place as abolitionists tried to protect Burns. Boston abolitionists eventually bought his freedom.
Step-by-step explanation:
The result of President Franklin Pierce's administration's determination to enforce the Fugitive Slave Act of 1850 in the case of Anthony Burns was that Burns, who had escaped from slavery in Virginia, was arrested in Boston in 1854. This led to mass demonstrations and a confrontation at the courthouse by abolitionists who tried to protect Burns. However, President Pierce supported the Fugitive Slave Act and federal troops were sent to ensure Burns was returned to Virginia and reenslaved. Eventually, Boston abolitionists bought Burns' freedom.