Step 1 : Introduction to the question "Who was the last U.S. President not associated with either the Democratic or Republican Party?"
...Millard Fillmore, the 13th President of the United States, holds the distinction of being the last president to represent the Whig Party and the last president not associated with either the Democratic or Republican parties. His presidency, from 1850 to 1853, marked the final chapter for the Whigs, a party that had risen in the 1830s in opposition to Andrew Jackson's policies. After Fillmore's term, the Whig party collapsed, paving the way for the rise of the Republican Party, which quickly emerged as a dominant force alongside the Democratic party.