Political violence in latin america in the 20th century: during the 1970s and 1980s and until the 1990s, political violence resulted in the death of thousands of latin americans, mainly in the countries of argentina, chile, uruguay, el salvador, guatemala, nicaragua and colombia. after this violent period, in some countries, truth commissions were appointed to investigate the killings and torture. it is important to preserve the history of these violations of human rights in the collective memory, or better to forget them? do you think that the preservation of the memory of these tragic events can prevent the repition of history? how should these be preserved?