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.
The "perfect tender rule" states that if the goods or the tender of delivery fail in any respect to conform to the contract, the buyer may:Reject the whole; or
Accept the whole; or
Accept any commercial unit or units and reject the rest.