Questions: In the controversy over "nullification" and the possible threat of secession by states' rights advocates, President Jackson could be described as a (A) secessionist. (B) bipartisan negotiator. (C) unionist. (D) Jeffersonian (E) republicanism advocate.

The answer is (C) unionist.

President Andrew Jackson was not a secessionist. In fact, he strongly opposed the idea of secession and believed in preserving the Union.

While Jackson did engage in negotiations and sought to resolve conflicts, his stance during the nullification crisis was firmly in favor of maintaining the Union, rather than acting as a neutral bipartisan negotiator.

Jackson was a staunch unionist. During the nullification crisis of 1832-1833, he took a firm stand against South Carolina's attempt to nullify federal tariffs and threatened to use military force to ensure compliance with federal laws, demonstrating his commitment to preserving the Union.

Although Jackson admired Thomas Jefferson and shared some of his political views, particularly regarding states' rights and limited government, his actions during the nullification crisis were more aligned with preserving the Union than strictly adhering to Jeffersonian principles.

While Jackson did support republican principles, this option is too broad and does not specifically address his stance during the nullification crisis. His actions during this period were more accurately described as those of a unionist.