The legal theory under which states were able to reject federal laws deemed unconstitutional was known as

The legal theory under which states were able to reject federal laws deemed unconstitutional was known as nullification.

Nullification, in United States constitutional history, refers to a legal theory according to which the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional under the United States Constitution (in opposition to the state's own constitution). The theory of nullification has never been legally upheld by federal courts.

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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.

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