Which U.S. President, nicknamed 'Old Hickory', was known for his populist policies and a controversial approach to Native American removal?

1. He was a general in the War of 1812, playing a key role in the Battle of New Orleans.
2. His presidency saw the rise of the modern Democratic Party.
3. He famously battled the Second Bank of the United States.
4. His time in office is often referred to as the 'Jacksonian Era'.