Well, a simile can include "like" or "as," so you could say, "The Continental Army's victory in the American Revolution was as powerful as a bolt of lightning." Unless you have to use "like," then it could be, "The Continental Army's victory in the American Revolution was like a power-punch to their enemies."
Hope this helps!
The Flexible response was a policy implemented by President John F. Kennedy in 1961 in order to substitute the New Look and the massive retaliation policy that Dwight Eisenhower's had introduced, which consisted on responding using a greater force in case of an attack, and such force involved nuclear weapons.
On the other hand, the flexible response policy aknowledges the Mutual assured destruction if nuclear weapons are involved, as the enemy with shoot back too. It aimed to provide a manner of responding to agression across the spectrum of war but without the employment of nuclear weapons.
The southern United States had the highest percentage of slaves. I am not sure what time period you are talking about but I assume you mean in the United States.