Protestant churches in the North preached particularly against slavery, blacks joined these churches and created associations such as the Wilberforce Colony within their enclaves. There was the “First Annual Convention of Colored People” in Philadelphia. They became more assertive, courageous and confrontational. There were regular attempts to rescue other slaves, even when some were with their masters. At this time, an all-black school was opened in New York and education was no longer a restricted commodity. Southern plantation owners were very tough: they grew cotton, sugar and tobacco. They were entirely dependent on slave labor and were strongly opposed to the abolition and emancipation of slaves. Their plantations were managed by supervisors. Slaves were also ranked based on their skills, with those with better skills receiving more privileges than others. Abolitionists were mostly Northerners who devoted time and effort to abolishing the slave trade and emancipating all slaves. The northern state was against the slave trade and began passing laws to stop it. William Garrison was a notable abolitionist. He founded the American Anti Slave Society. Some notable blacks