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What if Italy had a contiguous empire from Tripoli to Mogadishu prior to WWI?
I use the borders below on the basis of
Italy wins the Italo-Ethiopian War
Italy conquers Mahdist Sudan
Italy goes to war with Rabih az-Zubayr, resulting in expansion to Lake Chad
Italy gets Libya sooner, getting de facto control but letting the Ottomans keep nominal authority
Italy proceeds to establish a railroad along the following stretches:
Trans-Sahara: Tripoli - Sabha - Aozou - Lake Chad
Sudanic: Lake Chad - Abeche - Al Fashir - Khartoum - Port Sudan
East African: Port Sudan - Masawa - Addis Ababa - Mogadishu
I imagine a great many of the Italians who went to the US OTL would go to Italian Africa.
There'd probably be a lot of movement of peoples throughout Italy's empire.
I figure the map isn't exact, but it's a general idea.