this sounds very close to environmental determinalism at the basic level. be careful while i think it makes sense it isn't socially acceptable. (see Dr. Frederich Ratzel)
If you don't have some method of making written records (preferably portable) then you can't have a complex civil service or tax raising powers. If you don't have ploughs and domesticated animals,
what about the aelthing? the 1st european parliment formed in the late 9th century CE. the norse didn't have literacy at that time, the aelthing wasn't recorded until the sagas were in the 12th and 13th centuries.
i like environmental determinalism, culture from the environement, and technology/invention from the environment. tropical people were generally more primitive than those of cooler regions because they never had to save food or survive a winter (i realize this is a very basic generalization), but i think it has something to do with the topic at hand.
I think you are partially correct.