Acrisis erupted in the 1830s over the idea that a state could declare federal legislation invalid, prevent its enforcement, and possibly separate from the union. what word describes this idea?

The Nullification Crisis

Explanation:

During the administration of President Andrew Jackson erupted The Nullification Crisis  between 1832–33 turning into a political major issue. The Nullification Crisis involved a confrontation between the state of South Carolina and the federal government. An anonymous publication called  “South Carolina Exposition and Protest,” was released with the intention of posing the "Theory of nullification":

—the declaration of a federal law as null also voiding within state limits. It was argued that since the authority of the federal government was derived from the consent of the states, such states could nullify any federal law they considered unconstitutional.

Nullification

Explanation:

The theory of nullification was preached by Thomas Jefferson and James Madison. The states were said to have the authority given to them to be able to ascertain when the federal government goes beyond the powers they have and the states could term such acts as ‘void and of no force’ when it happens in their jurisdiction. When crises started between south Carolina and the federal government, a resolution was reached which nullifies the issue around federal tariffs in favor of the federal government and that weakened the theory of nullification.  

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the assassination of president lincoln was just one part of a larger plot to decapitate the federal government of the u.s. after the civil war. the first reaction to lincoln’s death was disbelief. then it quickly changed to grief. abraham lincoln’s death created an outpouring of grief from citizens in both the north and the south.

explanation:

lincoln was the first u.s. president to be assassinated. president abraham lincoln, america’s civil war leader, was assassinated just five days after confederate general robert e. lee surrendered his army at appomattox court house, ending the four-year war between the states. on the evening of april 14, 1865, lincoln was attending a performance of our american cousin at ford’s theatre in washington, d.c. john wilkes booth – a 26-year old actor, confederate sympathizer, and white supremacist – slipped into the presidential box and shot lincoln in the head. john wilkes booth and his conspirators had initially planned to kidnap lincoln to save the confederate states. but as the confederacy faltered, booth’s thoughts turned to murder. booth may have decided to act on his hatred after lincoln endorsed giving the right to vote to african-american men who had served in the union army.