Classify each of the following European countries as either members of the European Union or non-members of the European Union: Spain, Albania, the United Kingdom, Ireland, Romania, Germany.

Germany, Spain, Ireland, and Romania are all members of the European Union.  Of these countries, Romania joined the EU most recently.  Albania and the United Kingdom are not members of the European Union.  It applied for EU membership on April 28, 2009 and since June 2014 has been an official candidate.  The United Kingdom was previously an EU member, but withdrew its membership in 2020.