Conflict is easily arise between two parties with bitter past relationships. Kuwait and Irag were former British colonies, both were under the Ottoman Empire. Before the Gulf war happened, Iraq and Kuwait had already been in an intense relationship. Even though Kuwait was granted independence in 1961, Iraq had never recognised Kuwait's independence. They have had been unhappy about the unclear land dispute. Because of their bitter pasts, conflicts were easier arise between them. The intense relationship had continued to create conflicts for both sides such as how Irag was not happy about Kuwait not following the OPEC's quota of oil productions and prices and also, territorial dispute over a profitable oilfield. Bygones are not always be bygones, the bitter past would create more conflicts between two parties.
Another cause of conflicts is fighting over something of value. Recently, there were fightings and violence taken place in the Thai-Cambodia border area. Both Countries were fighting over the temple Preah Vihear. Preah Vihear was listed by the UNESCO as a World Heritage Site in 2008. Both countries decided that the world heritage site belonged to Cambodia in June 2007, but they were still fighting over a strip of land nearby. Both Preah Vihear and that strip of land are something of value for both Thailand and Cambodia. They may have signed on some agreements that what belonged to whom but conflicts can be arise over again.
A classic example of conflicts is one going against the wishes of majority. Do you ever idolise a pop band group? Then one day, your favourite member left the group suddenly. Most fans would be upset yet respect his decision but hardcore fans would not and it becomes a conflict. Park Jaebom was once in, a famous Korean pop band, called 2pm. He was the leader but one day, due to his past offensive message, he decided to leave his band for good. The chaos started when hardcore fans are not happy over his company's decision of not pulling Jae back to the group. They boycotted the band and threw all the 2pm discs they owned at the company's building. Jae's action of leaving the band had go against many fans' wishes. This caused massive mess in some streets of Seoul. Thus, conflict arise when one going against the wishes of majority.
In a nutshell, conflicts have many causes. The past conflicts might be the causes of present conflicts. Conflicts can be solved yet it can happen over and over again. Human can think and would think differently. Thinking differently would leads to conflicts but let's look at the causes of the conflicts at a brighter side. Walter Lippman said, "where all think alike, no one thinks very much." We are sometime somehow lucky.