Those mega-cities are a problem on so many levels - the world, and Africa in particular, won't miss one less.
Problem is that they are a sort of natural evolution in countries with rapidly evolving population : people go where there are opportunities that is to say cities and it makes a virtuous (or vicious depending on you point of view) circle as more people will go in. Whether the city is a megacity or not don't fundamentally change the issues of an overgrown city in transport shandy towns ect. I would actually be very surprised if the Niger region doesn't have at least three or four cities with 5+ million people (look at the population base : 140 million for Nigeria alone).
There will certainly be large cities there - I'd expect Ilorin to have a population of several million in the 21st century, with Lagos, Sokoto, the Adamawa industrial cities and at least one of the Niger Delta ports also above the million mark. For anything much
above five million, though, the borders are wrong. Migration from countryside to city tends to take place within borders rather than across them, so a city needs to be part of a big country in order to get really big. In OTL, all 170 million Nigerians are part of a single country, which has enabled Lagos to grow to the size it has (the absence of any other city that could qualify as an economic center has also helped), but in TTL, the region is divided among at least ten separate entities, many of them with their own economic center.
There will be big cities in sub-Saharan Africa and problems like industrial slums and peri-urban shantytowns - the Adamawa cities have them already - but nothing like OTL Lagos, which as Falecius said, is probably a good thing politically and environmentally. Cairo, on the other hand, might be even bigger than OTL because it has much of the Sudan to draw from.
I wonder why there isn't any link between Segou and Grand Bassam, isn't there a planed railroad?
There's an existing railroad; it's just that the map shows trading networks that
weren't created by the colonial powers. The empires' internal networks add another level of complexity - in the Niger Valley, they largely follow the pre-existing trade routes, but in the French and German colonies, they add to what was there before.
All this talk of city population is making me think about population growth patterns overall. Are there any demographic factors in TTL's West Africa that would make the population growth slower than it was OTL?
Increased urbanization, liberation of women, somewhat greater freedom to emigrate - they're on the rapid-growth side of the demographic curve now, but the shift will come earlier than OTL. The population of the Niger Valley in 2013 TTL won't be nearly 170 million.
Hmm... I wonder what the Gabonais and Luba would be trading in the Congo Basin (clueless about African trade).
They're small merchants, on a scale that doesn't threaten imperial monopolies - generally manufactured housewares and textiles in exchange for handicrafts, jewelry, coffee, nuts and oil seeds.
Jonathan, what are the relations between the Ottoman Empire and the Empire of Japan at this time? Would
Yamada Torajiro still be the Japanese ambassador to Istanbul? If so, there could be some serious butterflies that could be flown as Sultan Abdul-Hamid wanted to have friendly relations with another great independent power.
Hmmm. I imagine that the two countries would be friendly, because they were on the same side of the Great War and have no clashing political interests. There might be some element of "us against the Europeans" as well, but the Ottomans' relationship with Europe isn't as adversarial as OTL and the sultan has concentrated more on pan-Islamic unity than anti-colonialism. I'd guess that there would at least be an exchange of embassies and some level of bilateral trade.
Also, with the Ottoman Empire being much more developed than OTL, is her economy still dependent on rural agriculture? If not, then how much has industrial production contributed to the Porte?
Besides that, where would the Ottoman Parliament be convening?
Ottoman industrialization is a relative thing - it's more developed than OTL, but it isn't Germany or the United States either, or even France. There are several regions in the Balkans, northwest Anatolia and the Levant that are industrialized, but the majority of the country is still rural, with 70 percent or more of the people living on the land. With that said, though, the industrial regions are a key source of tax revenue and foreign exchange, and are one reason the Ottoman Empire was able to survive the war without collapsing. The Porte's revenues are at least twice what they were at this time in OTL, although there's a good deal of waste and maldistribution.
The parliament would meet in the capital, most likely in a building constructed for the purpose in the 1870s.
Also, is the Nizam of Hyderabad still modernizing his kingdom as per OTL
Hyderabad's been mentioned a couple of times. Popular protest forced the Nizam to allow a legislature of limited powers, and its members, some of whom are influenced by Abacarism or *Ahmadism, have taken the lead in development. The current Nizam is a modernizer, albeit conservative, and he and the legislature have worked fairly well together - thus far.
How are things going in the N'Dele kingdom?
It's still rather loosely controlled - the people are diverse and the infrastructure is rudimentary - and it's feeling out its relationship with Germany, trying to avoid angering the Germans while also keeping from being swallowed up.
South America and the Caribbean next, followed by the Ottoman world and Russia, and then one more narrative to close out the 1900-10 decade.