Raja Dahir defeats the Arabs

How does this change the history of the Middle East and South Asia?
The Brahman dynasty was somewhat expansionist, and I would suspect that the Turk Shahi and Zunbil kingdoms would fall under its influence. In a sense it would become the hegemon of the Indus Valley, paralleling the Rastrakutas of South India, Pala of East India, and Gurjara-Pratiharas of North India. Islamic Penetration into Afghanistan would be much slower and Hindu-buddhist influence would be stronger. Some Islamic dynasties such as Saffarids from Zaranj would be entirely butterflied, perhaps Ghaznavids and Ghurids due to weaker islamic expansion here.
 
This Indian kingdom would be more western-oriented than the other polities, and might try to bring eastern Iranian and indus valley regions under influence. Would be a major rival to Samanids if anything like it ever arises.
 
The Brahman dynasty was somewhat expansionist, and I would suspect that the Turk Shahi and Zunbil kingdoms would fall under its influence. In a sense it would become the hegemon of the Indus Valley, paralleling the Rastrakutas of South India, Pala of East India, and Gurjara-Pratiharas of North India. Islamic Penetration into Afghanistan would be much slower and Hindu-buddhist influence would be stronger. Some Islamic dynasties such as Saffarids from Zaranj would be entirely butterflied, perhaps Ghaznavids and Ghurids due to weaker islamic expansion here.

Ghurid and Ghaznavid expansion came from Central Asia southwards, through the Khyber Pass so a surviving Hindu Sindh wouldn't put a damper on that.

As long as there are powerful empires in Central Asia they will always view India as a rich Target and expand southwards
 
Ghurid and Ghaznavid expansion came from Central Asia southwards, through the Khyber Pass so a surviving Hindu Sindh wouldn't put a damper on that.

As long as there are powerful empires in Central Asia they will always view India as a rich Target and expand southwards
But there is a potentially of a Imperial Indian State rising out of Chach Dynasty. E.g. they had vassals as far as Zabulistan, and it's a possibility that they may attempt to consolidate the Indus Valley and bring portions of Eastern Iranian Plateau under influence, like Zaranj, Bamiyan, Ghazni, perhaps even Tukharistan. Remember we ar ein the 8th century, where the Sogdian principalities, Kushano-Hepthalite states, along Tang influence in Central Asia; since we are before 750 battle of talas. An additional strong rival to arabs would change how the Arab conquest of transoxiana proceeds. The dynasty of chach was very new, and the muslims exploited that to their benefit. A longer lasting state may have butterflies we can not imagine given knowledge we have presently.
It can not be certain how it will turn out, but we can safely say that Islamic expansion eastward could be quite different.
 
Ghurid and Ghaznavid expansion came from Central Asia southwards, through the Khyber Pass so a surviving Hindu Sindh wouldn't put a damper on that.

As long as there are powerful empires in Central Asia they will always view India as a rich Target and expand southwards

Well obviously this would shift the focus of India to the west and any Indian empire would devote the majority of their resources to securing the Khyber and Bolan passes.
 
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