World War 1 was one of the deadliest global conflicts in human history, began on July 28, 1914, and ended on November 11, 1918. The war took place throughout Europe, the Middle East, Africa, and parts of Asia. It destroyed several empires and killed millions of people. The estimated death toll of this war reaches about 40 million people.  In this war, moral principles and humanitarian values were abandoned and biological weapons were used.
Although the identification of the causes of this war remains controversial, scholars look at such factors as political, territorial and economic competition, imperialism, the growth of nationalism, arms races, a cult of the offensive, etc.
The war began as an excuse, but it had many factors and grounds that have roots in animal aspects of human origin. The main reasons for the outbreak of WWI were the greed of some rich and the power lobbyists behind the scenes, which led to the outbreak of the war. the main point of the story was that the colonial countries had clashed with each other in their interests and eventually the war broke out.
Islam is the religion of peace, as its name implies. What is emphasized in Islam is that human beings must live ethically. They must be content for what they have, and take aside avarice and excessive ambition. Of course, if people, and especially the authorities would had followed ethical values, mainly would follow the divine laws, the grounds for such destructive wars as WW1 were destroyed and the people of the world would live more peacefully.