Thank you for this explanation. If you don't mind I have these questions:-
in other words Akkadians and Amorites are descendants of Semetic (E-M123) Peoples that immigrated from Egypt? Where there other peoples living in the area when they did so?
*)What language did the J1-P58 communicate with? Wasn't it Semitic too?
*)If the E-M123 brought in the Semitic language to the area, and J1 absorbed it, why is it that today that J1 is the absolute dominant HG in the area (Middle east) in relation to E-M123?
see :
http://en.wikipedia.org/wiki/Proto-Semitic_language : out of Africa hypothesis
I believe the Semitic invasion finally caused the collapse of the Uruk expansion
E-M123 was in Akkadians and Amorites , and I guess later in Assyrians as well
And they were exported via the Phoenicians
But that is where their story ends
When they entered the Levant I guess there were J2 farmers and J1-P58 shepherds.
There were some J2 copperminers, traders and crafstsmen too :
http://en.wikipedia.org/wiki/Ghassulian_culture and
http://en.wikipedia.org/wiki/Timna_Valley
These fared well under the Uruk expansion
I believe some of the J2 traders and crafstsmen fled for the E-M123 Semities, they where the Minoans, arriving in Crete 5600 years ago ; Minoans were J2.
J1-P58 expanded toward Yemen 4300 years ago.
From there they conquered Arabia and Ethiopia.
Their last expansion was the expansion of Islam through the Middle East and North Africa.
The language J1 and J2 spoke befor is unknown
J2 spoke maybe something similar like the Minoans, but also about their language, not much is known , their script has never been deciphered