1 Poles came to the United States legally as Austrians, Germans, Prussians or Russians throughout the 19th century, because from 1772-1795 till 1918, all Polish lands
had been partitioned between imperial Austria, Prussia (a protoplast of Germany) and Russia until Poland regained its sovereignty in the wake of World War I.
2 Russia is a transcontinental country in Eastern Europe and Northern Asia. The vast majority of its population (80%) lives in European Russia, therefore Russia as a whole is included as a European country here.
3 Yugoslav Americans are the American people from the former Yugoslavia.
4 Turkey is a transcontinental country in the Middle East and Southeast Europe. Has a small part of its territory (3%) in Southeast Europe called Turkish Thrace.
5 Azerbaijan and Georgia are transcontinental countries. They have a small part of their territories in the European part of the Caucasus.
6 Kazakhstan is technically a bicontinental country, having a small portion in European hands.
7 Disputed; Roma have recognized origins and historic ties to Asia (specifically to Northern India), but they experienced at least some distinctive identity development while in diaspora among Europeans.
8 Ancestral home is a member of the European Union today despite disputes facing only for the United Kingdom over EU referendum.
9 Only for the UK and Ireland; they use a regional variation of the English language but traditionally distinguishes certain customs from Continental Europe.