The most important factor that motivated polk to acquire california as american territory was

Polk was very insistent to acquire California, it is because he very much wanted to start a negotiation between the United States and Mexico. He was even willing to give a threat of war just to be able to push the negotiation.

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.