Greece was united.
Greece . Philip of Macedon united most of the Greek mainland in the fourth century BC , with his son Alexander the Great rapidly conquering much of the ancient world , spreading Greek culture and science from the eastern Mediterranean to the Indus River . Falling under Ottoman dominion in the mid-15th century , the modern nation state of Greece emerged in 1830 following a war of independence . A founding member of the United Nations , Greece was the tenth member to join the European Communities ( precursor to the European Union ) and has been part of the Eurozone since 2001 .