Longwave began being eliminated 50 or more years ago.
From my perspective, LW developed for regional or national coverage before higher power MW transmitters were practical. Some European nations never developed LW, and others used it for rural coverage... some nations used it to cover offshore islands and the marine listener.
The Soviets seem to have liked LW, as it was an easy way to cover wide areas that had no local radio and poor communication with Moscow or regional capitals.
Numerically, there were relatively few of those stations. Here is the WRH listing for all LW stations in 1960:
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