Unfortunately, Pedro II was the victim of a defamatory campaign by the oligarchy that dethroned him. During his govern, slavery was abolish, sign by his daugther the Pricess Isabel, what created a great dissatisfaction among the oligarcs, supported by the military.

Not much has been taught about him in the schools, even today.

During his reign, Brazil was the number one country in Latin America, but after the coup, Brazil passed by a turbulent period and only recovered after WWII. At least four decades lost. I will reproduce here an extract from Sergio Diniz's answer to What caused most of South America not to develop as well as East Asia and Western Europe?

Brazil was then the main economy of Latin America; its decline came with the Republic (See Economy of the Empire of Brazil - Wikipedia