Simple. You pick a current event. A, and say how it was influenced by this historical event B, and how it was motivated by an even more historical event C. T

Simple. You pick a current event. A, and say how it was influenced by this historical event B, and how it was motivated by an even more historical event C. The only real advantage over starting with C, is that you have the motivating current event A to capture the attention of your students.