Subject	slavery
Predicate	be ended
Object	in all northern states in 1804
Modality	Modality Occurrences
Polarity	POSITIVE
Plausibility	0.4038
Neighborhood Sigma	0.4092
Local Sigma	1.0000
Example Sentences	Sentence Occurrences Source slavery was ended in all northern states in 1804 1 Answers.com Questions