Give me a hint — no answer revealed
Start with the full category, then apply the exact boundary: The ten-country enlargement of 1 May 2004. You only need one qualifying answer. A longer name is not automatically rarer.
Reveal a verified practice pick
CzechiaCzechia is one of the 27 European Union member states in the September 2026 reference set.
65This pick belongs to the selected question’s answer set. Points are a fixed knowledge rating.
Reveal all 10 practice answers
Points shown are our fixed knowledge scores. Opening this list reveals the whole set.
MaltaMalta is one of the 27 European Union member states in the September 2026 reference set.
96SloveniaSlovenia is one of the 27 European Union member states in the September 2026 reference set.
94LatviaLatvia is one of the 27 European Union member states in the September 2026 reference set.
92SlovakiaSlovakia is one of the 27 European Union member states in the September 2026 reference set.
91CyprusCyprus is one of the 27 European Union member states in the September 2026 reference set.
89EstoniaEstonia is one of the 27 European Union member states in the September 2026 reference set.
87LithuaniaLithuania is one of the 27 European Union member states in the September 2026 reference set.
86CzechiaCzechia is one of the 27 European Union member states in the September 2026 reference set.Aliases: Czech Republic · Česko
65HungaryHungary is one of the 27 European Union member states in the September 2026 reference set.
64PolandPoland is one of the 27 European Union member states in the September 2026 reference set.
42Why these answers qualify
Each entry belongs to the bounded set defined by the prompt. The named source supports the underlying facts; our editorial scoring is a separate layer.
Source: European Union · Member countries
Reference version: 2026-09-13. See our answer policy for how we handle aliases and omissions.