单项选择题
The Democratic Party led by Andrew Jackson represented the interests of（）
A.northern industrialists B.southern slave owners C.frontiersmen D.Both B and C
单项选择题 The Federalists advocated（）
单项选择题 The first period if the party system refers to the appearance of（）
单项选择题 There have been（）periods in the development of American political parties in the United States.
