By 1804 all of the American stat

By 1804 all of the American states north of _______ had abolished slavery.
A.Maryland
B.Quebec
C.French
D.Mercia
E.Henry Ⅶ
F.400
G.mixed member proportional
H.Sussex
I.five
J.Northern Ireland
K.immigrants
L.300
【正确答案】：A
【题目解析】：【考点点击】本题主要考查美国奴隶制的废除。
【要点透析】到1804年，马里兰以北的美国诸州已经废除了奴隶制。P201