Some events or short periods of change have such a drastic effect on the cultures they affect that they form a natural break in history. These are often marked by the widespread use of both pre- and post- phrases centered on the event, as in pre-Reformation and post-Reformation, or pre-colonial and post-colonial. Both pre-war and post-war are still understood to refer to World War II, though at some future point the phrases will need to be altered to make that clear.
Some events or short periods of change have such a drastic effect on the cultures they affect that they form a natural break in history. These are often marked by the widespread use of both pre- and post- phrases centered on the event as in pre-Reformation and post-Reformation, or pre-colonial and post-colonial. Both pre-war and post-war are still understood to refer to World War II, though at some future point the phrases will need to be altered to make that clear.