This is a short update, look for another one tomorrow, maybe even later today.
Once more unto the breach

We now turned our focus on the African nations. First was Songhay, our neighbour for more than 400 years.

They were filthy animalists, though they also had more than 400 years to learn our ways of fighting. This would be a hard fight.

But at first, everything went according to plan. Our legions caught one of their armies in the coastal provinces.

Look at how much better our drill infantry is.
In the North, we marched on their capital at Goa. Songhay tried to prevent this....

...but was beaten in two battles.
They soon assembled a large army and attaked us again at Goa.

But Roman discipline prevailed, the deciding blow being struck when the fresh I Italica arrived and smashed their flank.

In the east, we suffered some temporary setbacks...

But nothing could stop our advance in the west.
We soon had all of Songhay overrun, a task made much easier because most of their inner forts were just level 1 or 2.

Note that we were careful not to overextend here.

Still, such large provinces added to the empire is always a good thing, even if most of them are desert. But more importantly, we got control of all the trade ports of the Coast, allowing us to control 98% of the slave trade (2% being Kongo).

Songhay, much diminished, was waiting for its end.
In Suez, we got some bad news:

GRRR....why do they trade with the local farmers anyway? UGH.

Tech increases. Completely useless, as revolutions are bad, mmmkay.

As if there was anybody able to challenge our mighty fleet.

Finally, a useful tech upgrade.
Time to put the rifles to the test. We couldn't expand in Africa or Asia due to possible overextension, but I just know a nation which loves rifles.

DID ANYBODY SAY 2ND AMENDMENT, HURR DURR?

Well yes, Rome will take your weapons from your cold dead hands. Thank you for that kind offer.

What's that? You want to surrender? Home of the brave my ass. Now more like home of the slave.

While we were doing cleanup, we decided to take Peru instead.

Step 1: Land a few legions
Step 2: Assualt all the towns.
Step 3: Annex them.
Step 4: Profit.

All of the Americas belong to us, with the exception of those natives in the North (who will largely be our protectorates).
Meanwhile, in Africa:

One nation was openly Muslim, the only one left. It was also blocking land access to our southern African colonies. And it was rich in slaves, spices, ivory and grain.

Only one thing to do then.

In what was later known as the march to the south, the legions simply marched down the Zanzibar coast, crushing all resistance on the way.

Yeah....I would run.

An easy victory.

Wait...we finished it already? Huh. Well, I guess if you got an empire that could easily put 3 or 4 million workers on it things get done fast.
In any case, the trade must flow.
So: Asia conquered - check
Asia integrated - check
South America conquered - check
North America conquered - check
Africa conquered - all but Kongo and Songhay
Is there no challenge left?

Oh right. Hindustan.
(End of this update)