Simple, because almost all towns and cities in Oromia and South (including Addis Ababa) were founded during the time of Ethiopian Kings, all of whom spoke Amharic and were at least half Amharas and so brought their administration staff etc. with them to the newly founded towns. The biggest cities in most of Ethiopia, including Oromia are thus natively Amharic speaking, meaning that was so from the time of the foundation. That is why until today the lingua franca and the de facto official language of all these cities still is Amharic even though in many of these cities Amharic has no official status. But it is almost impossible in theses cities to do business and get a job etc. without speaking Amharic.
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