Resources:
Unlike Kilwa and other African societies/kingdoms the bulk of Somali wealth didn't directly come from slave raiding the interior and surrounding population. Infact the interior was connected to the coast via caravan routes and was used for producing products, supplying raw materials, resources/food, transportation and for manufacturing. States/kingdoms taxed rural populous production and collected costume duties through trade goods passing through which directly accrued them wealth.
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Long Coastline: gave us marine resources such as (pearls, ambergis, fish, salt, coral, shells, dyes, and expensive pigment from mollusks). Somalia's coastline has extensive coral reefs. Coral was burned to make lime to whitewash our stone houses and to use as sement. Coral was also used to make jewlery. Our sea shore gave us copal, amber,
coral, carnelian, glass etc we used to manufacture items and jewlery, for example rose water glass vases was a popular item Somali exported out.
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The river crossings, seasonal rivers and highlands: (shabelle, Juba , awash rivers/tributaries and northwest Somaliland/harrar highlands) provide for more arable grounds to produce surplus of various agricultural products (barley, wheat, chickpeas, daafi(teef), sorghum, coffee, millet,
On top of the tropical lowland climate made it suitable to cultivate mango's , dates, bananas, squash and sugar canes just mention the most popular fruits.
Our environment historically allowed for food surpluses, which in turn led to a non-agricultural work force, including a rurling class. Surplus crops and also form a tax base to support a central authority. This is contray to other Africans where the tetsy fly discouraged certain forms agricultural activity that allowed for this.
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The long pastures: that cover Somalia gave us abundant livestock (cows, sheep, goats, horses, donkeys and camels) , which gave us butter, pelts aka hide and skins (leather goods) , milk , meat, wool and fertilizer.
(Donkeys, horses and camels gave us transportation efficiencies as well). Lack of available pastures for grazing and disease prone climates like tetsy fly prevented this in other parts of Africa. Heck lack of livestock made certain Africans rely on and eat bushmeat.
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Mountain ranges: Which offered natural high elevated defenses but also bore extensive mines Somalis used to procure raw materials. There is evidence of mining, metal works in the Golis mountains, Harar highlands and in the Buur areas in the south with one city in Hobaad being a wealthy mining and manufacturing city.
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Hot and rocky landscape: , which has made it historically a hub for various spices , aromatics, and medicinal herbs (infact it could possible be argued that Somalia invented the spice trade)
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Geology: Somalia unlike other African countries has a geological landscape in many areas that allowed for available stone quarries that can be used for construction like limestone, granite and sandstone for building purposes and cement production. Whereas other African countries in many areas are characterized by laterite soils and sedimentary rock formations rather than extensive granite or limestone deposits and opted historically to use mud , adobe and timber are mostly available to them as building materials. Similar with Ethiopia their quarrying industry is not as developed as in Somalia, especially in rural areas. That's why the homes of Somalis are much better constructed than the slums you see prevail in different parts of Africa. Mentioned this another thread with examples:
https://www.somalispot.com/threads/...-with-indian-slums.173349/page-2#post-4170103
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Woodlands : Availability of wood which is extensively cultivated along the northern Somali coastal plain. Somalis used to also export, transport timber for dhow/ship and boat construction and exported it also to Arabia. They also used it locally to construct houses with it and for roof making on brick and stone houses , you can read more about it here:
Non-timber Uses of Selected Arid Zone Trees and Shrubs in Africa
All of what i listed above are clear resource advantages given to Somalis over other Africans due to our geography historically , it is made abundantly clear when you see the comparison to Oromo's who trend in the same way with other Africans: The eastern countries he describes as having ''a large heritage'' are Somalis.
This is a 1800s translated qoute describing the oromo petty kingdoms:
"The Galla kings have no budget, they do not have, as in some Eastern countries, a large heritage which keeps them alive; they can hardly hoard on the booty made in the field, because it must be distributed to the warriors. They must so resort to extraordinary resources, and this is the trafficking of children who provide them. Some, the most frank, receive a child tax in all families; others arrive at the same but by fines imposed as punishment for more or less serious offences real, and it is in children that the fine is paid. Such a chief is accused of conspiring against the prince (an absurd suspicion in a country where anyone who wants to seize power only has to mount a horse and call his followers), the children of the one suspected and those of his relatives, and the fact seems so natural that no revolt. These unfortunate people are sold in herds, at a low price and at cash, to the merchants from the north who come every year to tour the Galla kingdoms."
This is also true for Ethiopian Highlanders who would sell their own country men into slavery, to escape poverty, you see several examples of this with Tigray even and Afar. Because of Somali peoples mobility/fluidity and wide array of resources we never had to resort to this.
Kilwa sultanate that certain africanist brag about it as an example of Swahili/African civilization. Yet it slave raided the interior populations soo much that it depopulated whole areas and it literally operated like a coastal enclave, was not connected to any inland routes and its geography of mountains and thick forests limited inland access and therefore didn't have access to diverse products, outside of gold, slaves and ivory. It had no reliance on intermediaries as well. Not much different then the later Zanzibari sultanate, who followed the same historical trend minus the gold.