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All the American colonies had slavery, but it was usually the form of personal servants in the North (where 2% of the people were slaves), and field hands in plantations in the South (where 25% were slaves.)  These statistics show the early imbalance that would eventually tip the scale and rid the United States of slavery. 
Goldstein, Ilene Edwina. A Performance and Analysis from the Works of Bach, Beethoven, Brahms, and Persichetti .