One thing that pops up in world chat very often is "how do I get a second city?"
Well really the only way to get a second city is by buying the deed to a second city, which costs 250 pearls, or by getting lucky in the chance chests. There's no other way to do it. But that's why you should save your pearls! I know it's tempting to use them on resources but DON'T! SAVE IT FOR THE SECOND CITY! Trust me, doubling your income PERMANENTLY is WAY better than having a short bump of income.