You now have a domestic market after certain buildings being built that can change your trading experience which makes me think natives are more useful for long term trade. You can sell extra ships you have now, but ships now take tools, rope, sail cloth and also sometimes guns, swords and cannon goods. Now this mod adds more ways to play and options you might not have thought of. All cities have a city hall that must be upgraded once you create a settlement before you build other buildings and upgraded multiple times for others. Your cities have a sort of tier list on the type of buildings you can build and tier of building you can build. Your cities have health and happiness which makes you think carefully on how many slaves you can place in a city or if you can even afford to have slaves in your city. Your cities once their borders expand can work work an extra tile out. This mod brings many additions to the table. I'm slowly updating this guide when I have free time and it will take some time for me to finish it as update 4.0 is massive Unit and ship overview on materials needed for creation Here is the discord link for We The People To download this mod, get it off of github

There is also a domestic market, an economy within your own cities that your colonists will buy things depending on their specialization. There are tons more types of resources now, units, more colony nations you can play.

You can now get slaves from Africa and Native Americans that work harder in some places but do poorly in other areas. It adds the ability to trade with Africa and Port Royal. I would like to introduce you to this amazing mod that I have found that has brought civ 4 colonization to life! This mod is called We The People and changes the whole game.

Download civ 4 colonization