Your people did not establish anything. It was Sassanid bureaucracy which hold those dynasties in function. You may want to read some books.
No Semitic infighting ever compared to the Byzantine-Sassanid Wars, which has been the longest continuous war ever recorded in human history.
If you would have even read books, you would have notice that these young slave-soldiers were often voluntarily offered to the Abbasids by their parents because of greater ecnomic opportunities.
Historian Goldschmidt on this issue:
Does anyone care? Most Iranian people cluster together, look similar to ancient Persians and still nurture strong Persian culture.
Of course. Despite civilizations in the Arab world, let alone Arabia, predating the ones found in Iran by millennia. Despite actual civilizations and nation states in Arabia predating those in Iran let alone elsewhere in the Arab world.
Your entire pre-Islamic culture was heavily influenced by ancient Semitic culture. From your national symbols, architecture, royal titles (Kings of Kings is an actual Semitic title and has nothing to do with you) to alphabets to imperial languages (Aramaic). You even made your capital in Babylon. Nothing more is needed to be added.
Sure. However history shows something entirely differently. Try read about the Assyrian and Babylonian empires and their infighting with Semitic civilizations and entities from Northern Arabia, Levant and Southern Anatolia.
Some were but most of them were captured after battles. Or exchanged with other slaves. The facts of what I wrote remain the same and it is elementary knowledge.
So the conquered Persians tried to gain some influence in a foreign empire that ruled them? How is that any different from any example throughout history? You think that the bureaucracy of your Persian empire was not dominated by Semites and non-Persians (who were nowhere to be found in history pre-550 BC) whose languages, titles, architecture, clothing, customs, alphabet etc. they adopted?
If there is any foreign culture that has had an impact on the Arab one (Islamic times) it is the Greek one.
Everyone clusters in the Middle East. That does not change the fact that the only actual Persians in Iran are those living in Southern Iran (Persian heartlands) and ironically many of their descendants live in the GCC and another thing, they are very hard to tell apart in terms of appearance from their direct Arabian neighbors. I am afraid that some Iranian Azeri living 1500 km to the north across deserts and mountain ranges, who even looks differently on average, has much affinity to them other than cultural as they even speak a totally different tongue.
Speaking about influence, just 500 years ago Arabs had a vastly bigger influence on the Safavids than Iranians had on the Abbasids to such an extend that they altered the religious and cultural establishment in Iran:
Arab Shia Ulama
After the conquest, Ismail began transforming the religious landscape of Iran by imposing Twelver Shiism on the populace. Since most of the population embraced Sunni Islam and since an educated version of Shiism was scarce in Iran at the time, Ismail imported a new Shia Ulama corps from traditional Shiite centers of the Arabic speaking lands, largely from
Jabal Amil (of Southern
Lebanon),
Mount Lebanon, and
Syria, while to a much lesser extent from
Bahrain and
Southern Iraq in order to create a state clergy.
[37][38][39][40] Ismail offered them land and money in return for loyalty. These scholars taught the doctrine of Twelver Shiism and made it accessible to the population and energetically encouraged conversion to Shiism.
[34][41][42][43] To emphasize how scarce Twelver Shiism was then to be found in Iran, a chronicler tells us that only one Shia text could be found in Ismail’s capital Tabriz.
[44] Thus it is questionable whether Ismail and his followers could have succeeded in forcing a whole people to adopt a new faith without the support of the Arab Shiite scholars.
[36] The rulers of Safavid Persia also invited these foreign Shiite religious scholars to their court in order to provide legitimacy for their own rule over Persia.
[45]
Abbas I of Persia, during his reign, also imported more Arab Shia Ulama to Iran, built religious institutions for them, including many
Madrasahs (religious schools) and successfully persuaded them to participate in the government, which they had shunned in the past (following the
Hidden imam doctrine).
[46]
https://en.wikipedia.org/wiki/Safavid_conversion_of_Iran_to_Shia_Islam#Arab_Shia_Ulama
That's the only reason why you are a Shia majority country and why your leadership is able to brainwash a few Arab Shia groups. So you need to thank those that did all the work. Just like they are doing all the fighting today while you try to claim it.
And their descendants have been ruling Iran for the past 40 years and shaped an entire generation.