Does democracy reduce conflict?

This assignment will be arguing that democracy (as opposed to non-democratic states) does help reduce conflict (i.e. less wars, invasions etc) but that democracies still engage in conflict nevertheless. The conclusion should emphasise that although democracies are flawed because of this, they are still the best system of governance.

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Furthermore, if it is alright, I am asking that this assignment includes 20 academic sources to support and counter various arguments.