Summarise a Historical Event in Three Plain Sentences

You need the gist of a historical event and have precisely no patience for a fifteen-paragraph explainer. This forces the answer into three plain sentences: what happened, why, and why it still matters, so you walk away actually knowing something rather than having skimmed a wall of text.

Summarise [historical event, e.g. the fall of the Berlin Wall] in exactly three plain sentences: what happened, why it happened, and why it still matters today. Assume no prior knowledge of the period and avoid jargon. Keep each sentence under 25 words.