This resulted in a rise in slave revolts, especially in the 1860s and 1880s, which forced The federal government to alter the system to keep the state secure.[thirteen] Slavery was lawfully abolished in 1888. Brana Itaipu, najveća svjetska hidroelektrana prema proizvodnji energije i druga najveća po instaliranom kapacitetu (14 000 https://apaugustobd.alltdesign.com