Muckraker is the name give to a group of American journalists of the Progressive Era (1890s–1920s) who tried to expose corruption in big business and in government. One of the most famous muckraking magazines was <em>McClure's</em>, which tried to raise awareness about the social hardships (poverty, unsafe working conditions, etc.) caused by the power of big business in a rapidly industrializing United States.
The attitude of respect and the devotion to ones family observed in Chinese society especially in the imperial period is known as "filial piety," although other terms are relevant as well.
Because they could be turned into slave states, giving more power to the slaveowners in the south. Also, expansion policy and the dram of Manifest Destiny played a part in desiring that land.