If a country really wants to buy something but the other country doesn't want to sell; War.
If a country really wants to sell something but the other country really doesn't want to buy; War?
If a country trades with another country but develops more technology against that country to wire up their own little red button for 'just incase'; Trade but, intelligence and cover up and, war.


Tribes have control, their law is way, as do other ways of thinking that may opose 'the western agenda', in terms of laws, social vaules and banking code. Make a war, wipe it out, install your own - Problem solved.

Trade and politics can even be used as a weapon... If you deem something a crime.
Trade Embargo... The aim is to starve the people and cut off all trade until the government is gone.