Not 100% sure but I'm pretty sure siam was one of the only ones to escape colonization. look at effects on neighbouring countries?
Answer:
Slavery in Latin America was practiced in precolonial times.
Explanation:
During the Atlantic slave trade, Latin America was the main destination of millions of African people transported from Africa to French, Portuguese, and Spanish colonies. Slavery's legacy is the presence of large Afro-Latino populations.
Cave art could possibly be an answer
That they were done on slavery and that they believed in equal rights for all