Written by our dear friend GeneralGrim around July 19th, 2013.
If you are someone who has a hard time doing more then one thing at once, this may not be the game for you. When you have just one city, there is upgrading, researching, training, seizing, plundering, chatting, and reading mail that is all present. Now imagine getting to the point you have two, three, four, nine cities to keep up with.
The easiest way I have found to do this is always make sure you are in your Capital city when you log out, this will bring you back to the capital city when you log in next. Then, use up all that you can resources wise in the capital city, and what you can't use, load on trucks and send to the second city on the list. Keep doing this until you have all your cities upgrading, researching, and training something.
The seize thing, well, it can get real confusing with multiple cities. Everything for all your cities shows up in the same Intel list. So, just make sure you know the names of the cities and try and remember what city you told to do what and it will help.