I added the workers to the cities that had room for them.
I didn't get rid of any of my slaves, nor did I allow them to join my cities.
VMXA, since you don't use subs and cruisers, I'm guessing you don't use Battleships either, correct?.
I will use Cruisers as escorts for transports. I used to just use Destroyers, but cruisers have the same speed as Transports, so it is easier for me. If I have DD's and do not need transports, I make neither CA or BB.
I fill fool around at times and make a BB, if I have a situation where they arrive close to my shores, but not reach them. Then a BB can hammer better and get back.
Their lower movement and high cost makes them no so desired by me.
The screen shot of CAII did not show slaves, only workers. So I took that to mean they were gone. Anyway I very seldom get rid of native workers. Especially in Monarchy as I know I will be able to have all the free unit support I want in no time.
If I was in Republic, I may get in a spot were I dump a few and pop them out later. Not common though.
Subs are a problem in that they can get run into and trigger a war, that I did not want. They are slow and weak, so why make them. I really do not use naval forces that much. Yes there are always exceptions and you could park one as a spotter, I think I have done that 2 or 3 times in all these years.
Even on an island map, I just want to escort my invasion fleet, not fight at sea. A few pings is enough and later a couple well placed bombers. Maybe 2 or 3 DD's placed in the right locations.
I am not wanting to prevent landing, just them bombarding. The landings are good for my leader fishing. Exception is an island Sid game, the landings can become a serious issue.