This led to a rise in slave revolts, particularly in the 1860s and 1880s, which forced the government to alter the technique to maintain the region secure.[13] Slavery was legally abolished in 1888. Brana Itaipu, najveća svjetska hidroelektrana prema proizvodnji energije i druga najveća po instaliranom kapacitetu (14 000 MW) https://uigracayc.vidublog.com