One source of differences in ethics between people, companies, and nations is economic state. A person, company or nation that is having difficulty maintaining a healthy trend may end up compromising their ethical values and join interesting ways to try and make it through or measure up to those in the upper class. These end up in bribe, corrupt deeds such as production and overpricing of substandard goods and services.
I disagree with SheilaA i belive that there are two main reasons that you can tie to any world happening of conflict and that is an unbalance of power and religon. unbalance of power becasue when one group has more power then another they will fight to keep hold of it while the others will fight to gain power, for example WWI prince ferdinand marched throught yugoslavia which he occupied. so ferdinand had power. he was assassinated by by a group called the yong bosnians. who lacked power and tried to gain it. thus stating WWI same thing with eny other conflict. religon is a very tricky subject as it in some times acts as a pass or right to kill, kill in the name of the lord,god, ect. it has also unraveled many conflicts throught out histroy, like the crusiaids.