What explains the democratic peace, and from which perspectives and levels of analysis do those explanations come from?

What will be an ideal response?

First, democracies may be more peaceful than all other states (an argument from the identity perspective at the domestic level of analysis). Second, democracies share common domestic norms and institutions (identity perspective/systemic structural level of analysis). Third, democracies trade more with one another and do not want to lose the mutual gains from trade (liberal perspective/systemic process level of analysis). Fourth, democracies belong to the same international institutions, whose laws and practices they follow (liberal perspective/systemic process or systemic structural level of analysis). Fifth, democracies have unique contracting or negotiating advantages that let them resolve disputes with war (identity perspective/systemic process level of analysis). Sixth, democracies belong to the same alliances, counterbalancing or fighting other alliances (realist perspective/systemic process or systemic structural level of analysis). Seventh, democracies successfully use balance-of-power politics to avoid war (realist perspective/systemic process level of analysis). Lastly, democracies do not go to war with one another because leaders have to appeal to larger coalitions to survive politically and, therefore, choose wars only with nondemocratic countries in which democracies enjoy an advantage in mobilizing military resources (liberal perspective/domestic level of analysis).