The most important information for explaining Andrew Jackson's "bank war" would be Jackson's distrust of the Second Bank of the United States.
Jackson believed that the Second Bank of the United States was too powerful and that it favored the wealthy and well-connected. He argued that the bank was not doing enough to help common Americans and that it was engaging in corrupt practices.
Jackson was a populist president who appealed to the common people. He believed that the government should be run for the benefit of the people, not for the wealthy and powerful. He was opposed to special interests and monopolies, and he saw the Second Bank of the United States as an example of both.