In few words:
every single world shapes the same way , you have a lot of premades in the core , and less premades on the rim.
this causes the same physics reaction every time you play a world.
the wars start in the core , usually premades picking on random tribes that are not as strong, maybe recruiting 1~2 players from that tribe if shown to be good. then after getting a little foothold , premades in the same K war each other for a week , untill 1 of them looses few villages, then they merge , bcz experienced players always tend to come together , just like a magnet .
but as roch said , it starts with "protection and survival of the fetus" reasons.
now u will have many experienced players in the same continent under the same banner. suppose u have 4 K's in the core each K dominant tribe usually goes to another direction, towards the rim, which is less challenging , usually.
those 2~3~4 tribes usually will have a nap or an alliance together , not in all cases , but most. and this diplomacy will be mostly long lasting so those tribes can grow rapidly.
and while the rim players had this time to enjoy growing , now they will have a solid , core tribe looking at them. unless this rim tribe is really dedicated , there is no winning. new recruits from those rim tribes will join the core tribes ,as in this period many of the core players will quit , lack of expansion area.
at this phase the world is moving towards the rim , day in day out , for almost 2 years or so. after the rim tribes were eliminated or merged with the core tribes the world will take a sudden turn, biggest and bloodiest wars in the core.
the last few episodes of a world for a core player is the most exciting , if those core players survived the inactivity syndrome during this whole time , and sent long range attacks, in order to expand , their hard work will be repaid , eventually core players at the end will war close range, and thats the most fun in TW . if u can stick around and kick hardly throughout all that time like a salmon trying to go against the flow to lay its eggs, then the pay-off is far better than being a rim player.
Ps: i am not saying that rim tribes wont succeed , alot of rim tribes and i mean alot , have became rank 1 at a point, but ill root for the core.
also mostly rim tribes tend to form families .
the reason behind it is simple , to fight off 50 v.good players who have expanded , u will need 100 nubs 50 mediocre and 50 good players on ur side . values may vary D: