The United States has been lucky. I doubt there is anyone alive today that has seen the CONTINENTAL United States as a battle zone (1865).

The last time for Alaska is 1942 (Battle of Midway but there was pretty much nothing there). Hawaii was in the theater of operations for the entirety of American WWII.

Rioting, unfortunately, is fairly common but of fairly limited duration with the resumption of civil control in a short time. For this scenario, discretion is likely the better part of valor (72hr BOB). Short term evacuations for a limited distance are reasonable

Is it reasonable to prepare for long term disorder? Is it even possible? This question is a hard one. During Vietnam, the civilian population stayed put and the war was largely fought around them. Attempted evacuations during the fall of South Vietnam suggests that believing American promises to be foolhardy. I don't recall large scale civilian evacuations during Korea. During WW II, evacuations were not possible. Before WW II, many countries declined to accept refugees and many affected populations declined to even try to escape until it was too late.