Why did Phule dedicate his book Gulamgiri to the American movement to free slaves?

• To argue against all forms of inequality, Phule extended his criticism of the caste system.
• He established a link between poor conditions of American Black slaves and people of lower castes in India.
• Phule dedicated his book named Gulamgiri to all the Americans who fought against slavery, it was written in 1873.
• Jyotirao Phule was concerned about humiliation of the low castes, the miseries of the labourer, and plight of upper-caste women.