Who was First Lady during James K. Polk's presidency?

In what year did James K. Polk first take office as President? In which state was James K. Polk born? Who served as Vice President under James K. Polk? Under which president did George M. Dallas serve as Vice President? Sarah Polk was married to which president? Which number president was Zachary Taylor? Who succeeded Zachary Taylor as President of the United States? Who was President immediately before Zachary Taylor?