Well... 9/10 for the idea, but 2/10 on the execution. Let's try this again, filling in the other ones.
Revolutionary War - Basically what is above for the Civil War
War of 1812 - The time limit on the restraining order expired, and the crazy ex-girlfriend came back, and lit the capital (our genitals) on fire. That bitch. We slapped her back across the ocean.
Civil War - Either a necessary event that had massive casualties on both sides to free humans from being owned, or those stupid Yankees comin down and takin er jerbs, states rights, whatever (totally not about slavery, obviously), depending on which side of the mason-dixon line you're on.
Vietnam War - First rule - Never talk about the vietnam war.