He was a Young America expansionist who signed the Gadsden Purchase of land from Mexico and led a failed attempt to acquire Cuba from Spain. He signed trade treaties with Britain and Japan, while his Cabinet reformed their departments and improved accountability, but these successes were overshadowed by political strife during his presidency. His popularity declined sharply in the Northern states after he supported the Kansas–Nebraska Act, which nullified the Missouri Compromise, while many whites in the South continued to support him. Passage of the act led to violent conflict over the expansion of slavery in the American West. His reputation in the North suffered further during the American Civil War as he became a vocal critic of President Abraham Lincoln. Pierce read law briefly with former New Hampshire Governor Levi Woodbury, a family friend in Portsmouth, New Hampshire.