I'm not gonna talk too much about drafting, if you want to know more check out this thread
http://forums.civfanatics.com/showthread.php?t=188581...
I generally use it for Rilfles When the Civ's Traits are either Spritual or Aggressive, (Drafted get combat 1 from agressive you know)
And Sometimes I draft when I have a UU advantage... obvious one is English Recoat, you could also try drafting Musket UU eg- France and Ottomen
If your quick enough to get to Nationhood early you could also draft Maces but they have a VERY SMALL WINDOW OF OPPOTUNITY
Slavery vs Nationhood?
Well Slavery is good for the early game because you have a low happy cap and it's best to whip off your unhappy pop. By the time you reach the industrial ages Universal Sufferage is a couple of techs away after Nationalism so slavery isn't as effective (In most games in general) growing back Large pop is more time consuming then growing back a small pop so your better off rushing with cash at this point in the game.
If you want to rush units drafting is your civic, it takes 5 turns for a Civ to change between Civics, and on a standard map you can draft up to 3 units per turn. I generally (in a CE) go from Bureaucracy to Nationhood to Free Speech after drafting 15 units (without causing too much unhappiness)
So it'd optimal to have a large emprie of 15 cities obviously. I guess you could have 11 cities if you draft your globe city repeatedly.
In order to draft your city must have
- A minimum Pop of 6
- A minimum 10% of your City's nationality is of your own Civ
eg - if you were Rome, 10% must be of Roman Nationality the 90% can be anything else.
You generally use your Drafted units in combination with your veteran Units like Maces from previous wars who have CR3 (of course yo u can upgrade them)
Of course you could use your 15 drafted units to capture a city or two if you Quick or attacking a backward Civ.
Check your Low food Cities I know they grow slowly BUT by this point in time you have a High happiness cap, Imagine a city with 1 food resource and many plains and hill tiles, by logic and calculation you estimate that it's max pop is 12. The City has a Max Happiness cap of 24 and has 12 Unahappy Citizens.
SO???
You can Draft that Same City 4 times!!! and balance out the happy and unhappy cap, 4pop for 4 Units and No happy citizens??? WHY NOT!?