what are the things that divide people today ? do you think that negotiations can resolve conflicts ? if yes , how ? what should be done in the latter case ?

There are plenty of things that divide people today. First of all the borders of the countries, their ideologies, their class and caste differences, their religious differences and their financial differences. Although there are so many differences, yet all men are the same. Basically, everyone is peace loving at heart. In this modern age, everyone is tired and fed up of wars and attacks of terrorism. A common man wants to lead his life in harmony with others. 
Any conflict that arises between humans can be resolved by negotiating with each other. Talking with an open heart proves helpful. At the higher level, or the government level too,  conducting discussions and reaching to solutions that are beneficial to both the sides is a very good way of resolving conflict.