This article aims to present the characteristics of modern warfare based on in-depth research on the march of the new Cold War between the United States and Russia, the trade war between the United States and China and its consequences, financial warfare as a weapon of modern warfare, cybernetic warfare as a modern warfare, the inevitability or not of the 3rd World War, the causes of violence and wars in the world to, in the end, present how to eliminate wars on the planet. The new Cold War results from the fact that the United States and NATO forces are expanding their presence on Russia's borders. The trade warfare was triggered by the United States against China to prevent this country from assuming the status of hegemonic economic power on the planet. Financial warfare has been unleashed by the United States, against its enemies such as Iran, Russia and China, with the aim of degrading the capabilities of its enemies and subjugating them with the adoption of economic and financial sanctions, while seeking advantage geopolitics in specific areas to bring the enemy country to a state of near collapse and paralysis, to financial catastrophe while advancing on other fronts. Cyber warfare is being unleashed by the United States, Russia, China, among other countries to attack computers and networks of enemy countries that affect resources necessary for war by studying the system deeply to discover its flaws and using these flaws to control this system or destroy it. The decline of the United States and the economic rise of China, which may assume the condition of the greatest world power in the mid-21st century, may trigger the 3rd World War in the face of the tension created between them. Parallel to the effort to educate all human beings with the culture of peace, it is necessary to put into practice a democratic governance of the world to prevent the recurrence of new world wars. This is the only means of survival for the human species and to stop the decay of humanity.