id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-1412 Iran - Wikipedia .html text/html 35315 5059 67 In the 15th century, the native Safavids re-established a unified Iranian state and national identity,[4] with the country's conversion to Shia Islam marking a turning point in Iranian and Muslim history.[5][17] Under the reign of Nader Shah in the 18th century, Iran once again became a major world power,[18][page needed] though by the 19th century a series of conflicts with the Russian Empire led to significant territorial losses.[19][20] The early 20th century saw the Persian Constitutional Revolution. At its greatest extent, the Achaemenid Empire included territories of modern-day Iran, Republic of Azerbaijan (Arran and Shirvan), Armenia, Georgia, Turkey (Anatolia), much of the Black Sea coastal regions, northeastern Greece and southern Bulgaria (Thrace), northern Greece and North Macedonia (Paeonia and Macedon), Iraq, Syria, Lebanon, Jordan, Israel and the Palestinian territories, all significant population centers of ancient Egypt as far west as Libya, Kuwait, northern Saudi Arabia, parts of the United Arab Emirates and Oman, Pakistan, Afghanistan, and much of Central Asia, making it the largest empire the world had yet seen.[14] ./cache/en-wikipedia-org-1412.html ./txt/en-wikipedia-org-1412.txt