The darkest shade is for the founder states of the EU, progressively lighter shades indicate more and more recent joining. This map shows each state as it was at the time of its entry, so that the then West Germany which was a founder state in 1951 is shown separately from the then East Germany which was annexed in 1990. See en:Enlargement of the European Union for a list of entry dates.

Image source: Modified (colors softened) from en:Image:Test Crude-EU25-colored stretched greens.png

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