Explanation: Many European countries, including Ukraine, which is currently struggling against an imperialist incursion by Russia, have laws on the books which restrict or restrain elections during wars which violate the territorial integrity of the polity - ie, that holding elections while being bombed is impractical, and holding elections in occupied territory is impossible.
The US, being a vast country even at its youngest point, founded in an era before motorized armies and aerial bombing, and insanely attached to the one document that lays out the processes of our government (because if we weren't, we'd immediately start killing each other over what it should be instead), has no such laws. During the US Civil War, we just ignored the South during the 1864 election. Doing so resulted in the most radical and forward-thinking (relative to contemporary society) Congress in US history, and a resounding re-election victory for President Abraham Lincoln.
... we gave the South their fucking voting rights back too soon.