This paper formulates a three-phase model of regime change, domestic c
onflict, and interstate conflict inspired by the case of Germany betwe
en the First and Second World Wars. In the first phase of the German c
ase, democratization during the Weimar regime was followed by chronic
political instability and conflict. During the second phase, a weak We
imar regime set the stage for the emergence of the National Socialists
and the erosion, and subsequent elimination, of democracy under the d
ictatorship of Adolph Hitler. In the third phase, autocratization of t
he German state was followed by an increasingly aggressive foreign pol
icy during the late 1930s - the prelude to the Second World War. I exa
mine whether this familiar, if spectacular, example of democratization
, instability, democratic erosion, and aggressive foreign policy is ge
neralizable across a larger spatial and temporal domain. Testing hypot
heses derived from the model's three phases, I draw the following prim
ary conclusions. First, new democracies are subject to significant lev
els of mild and severe forms of domestic conflict, although the findin
gs suggest that new autocratic states are also subject to more severe
domestic conflict for a longer duration than conflict experienced by n
ew democracies. The empirical results for the second phase of the mode
l indicate that polities afflicted with high levels of domestic confli
ct are more likely to become more autocratic. Lastly, I find support f
or the model's third hypothesis that new autocracies are more likely t
o originate conflict with other states, and this relationship is fairl
y strong across pre- and post-WWII samples. Interestingly, new democra
cies are found to be more likely to initiate disputes in the pre-WWII
sample, but not in the post-WWII sample.