Rise to Globalism: American Foreign Policy since 1938

Ambrose covers a broad span of history—I'm curious about what guided his focus on certain policies or moments over others. Did he aim to tell a specific story or simply include everything significant?

Reading this made me reevaluate some assumptions I had about America's international actions. Did others find their understanding of certain events changed after reading?

That specific starting point marks a pivotal moment in global history, but I wonder what motivated Ambrose to frame the narrative from that year onward. Was there a particular reason or event that influenced this choice?