"By the twentieth century there has been a series of successive collapses of both the Greek and Jewish Diasporas. The expansion of the Greek kingdom until World War I brought Epirus, Thessaly, Macedonia and most of Thrace within its expanding borders. The disastrous military adventure of 1922 emptied Asia Minor of its 3,000-year old Greek and Orthodox Diaspora. Turkish pressure has reduced the Greek population in its European areas. Egyptian nationalism sent most of the Alexandrian Greeks back to the homeland during the 1950s, while Communist pressures adversely affected Balkan Greeks and the decline of die Soviet Union and its successor states brought some 300.000 Russian Greeks to the Mediterranean."