No one can talk about them in form of modern day countries that exist today, you should grasp that first of all.
Iran as a state has existed for several millenia with a remarkable, largely unparallelled continuity.
They were Azeris,
Actually, the Safavids were originally a mystic order from north-western Iran, composed of people from various Iranian origins. There were Kurds among them, as well as Azaris.
spoke Azeri Turkish, and also came from territority of Azerbaijan. So was their military force, the Qizilbash, which is itself an Azeri word.
Azarbaijan has always been a province of Iran. Therefore, if they came from Azarbaijan, they were Iranians. An Iranian must not necessarily have Farsi as his exclusive mother tongue, the concept of an Iran polity was never based on "ethno"-linguistic exclusivism, which is a backwards, primitive concept.
Azerbaijan is a region from Hamadan to Derbent, Azerbaijan is the land where Azeris live.
The region you are referring to is not homogeneous from an "ethno"-linguistic point of view at all, since it is not only inhabited by Azari Iranians. Kurds, Armenians, Assyrians, Talysh, Tati, Gilaki, central Iranians, Lors, Bakhtiyaris, are also native to this area, not to mention the many Caucasian groups on the Daghestan-Azarbaijan border region, and most importantly, the great majority of Iranians who are in fact of mixed
So Azarbaijan is a region where Azaris and other Iranian (and some non-Iranian) peoples live, in addition to being a historic province of Iran.
Baku, Tabriz are all same to Azeris.
This is not true, the loyalty of Azaris in Iran lies with their Iranian motherland and noone else. The same goes for Kurdish Iranians, Baluch Iranians, etc.
Linguistic links to former Iranian territories lost to Russian and British imperialism in the 19th century, does not imply political identification with the newly independent states formed on those territories.
Like said, stop falsifying history of Azeri people. When you act like this, then you wonder why some Azeris would want to separate.
First you should be able to respect Azeris, their idenity, their history. And not only you of course.
There is nothing wrong nor disrespectful in what brother k-Alavi wrote. He actually confirmed the contributions of the Safavids to the creation of a modern Iranian state, yet you contend he is "falsifying" history, while his comment perfectly reflected the actual, established findings that pan-Turkist revisionism so desperately and amateurishly attempts to question. Revisionism which, by the way, is not taken seriously by anyone in Iran, least of all by Azari or other Iranians who speak a Turkic dialect.
Iranians (specially Azari Iranians) will not allow any foreign puppet regime working with extra-regional enemies (USA / Israel) to use ethnic bigotry to threaten Islamic solidarity and national integrity. If, or rather when, however, the Shia Muslim people of the republic of Azarbaijan choose to embrace their roots and join the Islamic Revolution and the Iranian motherland, they will be welcomed brotherly.