Which U.S. President, nicknamed 'Old Hickory', was known for his populist policies and fiery personality, leading to a significant expansion of presidential power and the controversial Indian Removal Act?

1. He was a military hero in the War of 1812, particularly at the Battle of New Orleans.
2. His presidency saw the nullification crisis, a challenge to federal authority by South Carolina.
3. He famously opposed the Bank of the United States and vetoed its recharter.
4. His political movement gave rise to the modern Democratic Party.