I thin5 % charged on purchases of ordinary goods
Explanation:
In Africa the climate is very harsh
To trade sometimes people have to go very far distances and cross many different climate zones
For example in the desert climate zone, temperatures in the day can get very hot. At night the temperatures can drop below zero.
The harsh climate can affect how fast it will take for traders to get from one place to another. The climate can also affect the amount of goods or kinds of goods the traders can bring or purchase.
-Growth of ethnic nationalism throughout Europe and Middle East
The idea of the need of a "pure race" or of races of usurpers in the countries were getting common.
-Colonial groups looking for independence from imperialistic powers
This alone was more than reason for many to attack others from their own country. The problem is that the line is always blurry when it comes to decide the targets of the attack and who are actually the supporters of the enemy that deserve to be attacked. In the end, many just decided that just being against the cause was enough to add someone to the casualties.
-Spreading of communism and socialist ideas throughout the world
This enough generated many problems with the war between classes and the very troubling ideas of non existence of private properties and many other things that led straight up to physical conflicts, abuse of power and so on.
There wouldn't be a USA, and...
the Indians would still have pretty much all of the Middle-west of the USA.
Hawaii would still be under their kings/queens
Alaska would still be part of russia
China would pretty much never had any technological progress (they isolated themselves)
Japan would still be going around with pretty much katanas.
etc etc
if you want more i can give you more (if you want information on why one is on the list, post it in the comments)
hope this helps