You're giving a speech to your class about the effect of having too much power in the executive branch. which historical event would be the most useful to include? a. president johnson's escalation of the vietnam war after the tonkin gulf incident b. president eisenhower's insistence on having a us interstate highway system c. congress overriding president truman's veto of the taft-hartley act d. president kennedy's declaration for the united states to put a man on the moon