I'm surprised that the Hetalia fandom hasn't used this song for AMVs! Explanation: This song is about the Berlin Wall, as it mentions the dates that it was built (1961) and that it fell (1989). The Berlin Wall is a famous example of the division between Eastern Europe and Western Europe in the 20th century when the Cold War was at its height, and no one from East Berlin was allowed into the Western sector after the wall was built. (Several desperate people died trying to cross this wall) I encourage you to
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