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Yes, it became a member May 1st, 2004
"Poland (with other candidate countries) finished the accession negotiations in December 2002. Than the Accession Treaty was signed in Athens on 16th April 2003. After the ratification of that Treaty, Poland and other 9 countries became the members of EU on 1st May 2004."
http://www.poland.gov.pl/Poland%E2%80%99,s,way,to,UE,458.html
"Poland (with other candidate countries) finished the accession negotiations in December 2002. Than the Accession Treaty was signed in Athens on 16th April 2003. After the ratification of that Treaty, Poland and other 9 countries became the members of EU on 1st May 2004."
http://www.poland.gov.pl/Poland%E2%80%99,s,way,to,UE,458.html
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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