Mansfield and Snyder (2002, 2005), while agreeing that there have been no wars between mature liberal democracies, state that countries in transition to democracy are especially likely to be involved in wars.
Mansfield和Snyder（2004、2005）認為成熟的自由民主制國家之間的確不會發生戰爭，但他們主張那些正在進行民主轉型的國家最容易捲入戰爭。