Why would the feudal system being abolished be beneficis
ched be beneficial to the 3rd estate?

The end of feudalism resulted in the end of imposition of taxes and other type of liabilities on the people of third estate.  

Explanation:

The end of feudalism resulted in the favor of third estate (common people of the estate, who were not rich and wealthy). The end of feudalism resulted in the end of imposition of taxes and other type of liabilities.

The National Constituent Assembly which was acted on the 4 August 1789, abolished the system of feudalism in the France. This system gave freedom to the people of third estate from the burden of taxes as they were earlier forced to pay to the government of the Louise XVI.

answer: secession

secession, as it applies to the outbreak of the american civil war, comprises the series of events that began on december 20, 1860, and extended through june 8 of the next year when eleven states in the lower and upper south severed their ties with the union. the first seven seceding states of the lower south set up a provisional government at montgomery, alabama. after hostilities began at fort sumter in charleston harbor on april 12, 1861, the border states of virginia, arkansas, tennessee, and north carolina joined the new government, which then moved its capital to richmond, virginia. the union was thus divided approximately on geographic lines. twenty-one northern and border states retained the style and title of the united states, while the eleven slave states adopted the nomenclature of the confederate states of america.

explanation:

the answer is prolly b