I was reminded on twitter that international relations professors have trained students for generations to focus on the third and second levels of analysis and dismiss the first--that individuals and their characteristics matter much less than the constraining impact of institutions and the incentives provided by the international system. So, should we just apologize as Trump sells out the postWWII order and ends American hegemony by whim or fiat? No, we need to drink heavily. Seriously, there are a few real responses to this question of agency and structure. First, realists will say, and...