Pan-Iranism (Pān-Irānism) is an ideology that advocates solidarity and reunification of Iranian peoples living in the Iranian plateau and other regions that have significant Iranian cultural influence. According to the Routledge Handbook of Persian Gulf Politics: "One important point distinguishing radical nationalism of pan-Iranism from pan-Arab or pan-Turk orientations in the region is the fact that the Iranian version currently does not seem to include irredentist plans in its political program. Rather than demanding the return the lands separated from Iran in the past, such as Afghanistan, Tajikistan, the Republic of Azerbaijan, Bahrain, or the Kurdish areas of Iraq and Turkey, the Pan-Iranist Party emphasizes the cultural integration of the Iranian civilizational basin." Iranian political scientist Mahmoud Afshar developed the Pan-Iranist ideology in the early 1920s in opposition to Pan-Turkism and Pan-Arabism, which were seen as potential threats to the territorial integrity of Iran. He also displayed a strong belief in the nationalist character of Iranian people throughout the country’s long history. On the eve of World War I, pan-Turkists focused on the Turkic-speaking lands of Iran, Caucasus and Central Asia. The ultimate purpose was to persuade these populations to secede from the larger political entities to which they belonged and join the new pan-Turkic homeland. It was the latter appeal to Iranian Azerbaijanis, which, contrary to Pan-Turkist intentions, caused a small group of Azerbaijani intellectuals to become the strongest advocates of the territorial integrity of Iran. After the constitutional revolution in Iran, a romantic nationalism was adopted by Azerbaijani Democrats as a reaction to the pan-Turkist irredentist policies threatening Iran's territorial integrity. It was during this period that Iranism and linguistic homogenization policies were proposed as a defensive nature against all others. Contrary to what one might expect, foremost among innovating this defensive nationalism were Iranian Azerbaijanis.