The British and American antislavery movements were closely interrelated, often organizationally intertwined and heavily dependent on British philanthropic monies.  Although there were antislavery movements in France, Spain, Portugal and other European countries, the philosophical, religious and social interrelationships within the Anglo-American antislavery movements were unique. Left: British antislavery campaign banner.  Right: William Lloyd Garrison’s campaign banner.  Credit:  Massachusetts Historical Society.