Culture is a word for the way of life or set of attitude or behaviour of groups of people, meaning the way they do things and is usually communicated from one generation to the other.
Non Traditional Culture are culture that are used in civilised environments or society based on modern beliefs, rules, symbols and principles and are relatively open to other cultures, technology and social innovations unlike Traditional culture that are shared experiences that are transferred from generation to generation.
The California Gold Rush sparked a movement west, which only further ignited manifest destiny. People saw the opportunity to stake a claim of their own and truly pursue the "American Dream" out west. This new discovery and the abundance of wealth to be had further solidified support of Polk's decision to move westward.