Answer:
I think the answer is because it is an easier way to bring goods back and forth between states, making trades and transportation less of a struggle.
Explanation:
Knowledge
Shell shock is basically PTSD and it was thought to be caused by soldiers being exposed to explodeing shells
In early 1990 Iraq was accusing Kuwait of stealing Iraqi petroleum through slant drilling, although some Iraqi sources indicated Saddam Hussein's decision to attack Kuwait was made a few months before the actual invasion.
Plague is a deadly disease that people are afraid of.