It is in human nature to fight mainly due to four things power, women, money and land. Only thing which could have been different without involvement of US would be localisation of conflicts instead of globalise results obtained. Pick up history of the world. We will find wars, conflicts and fights everywhere. It has been more devastating when boarders have been crossed. Severity of damage is directly proportional to the number of boarders crossed.
The question is whether or not the highlighted is correct?
Let's look at WW1 and WW2 as an instant.
Serbia and Balkan Campaign was started at the onset of the war. And the war quickly propelled into France and Belgium in the autumn of 1914 and France, and British Commonwealth Joined the war.
When that happened, Commonwealth Force Siege German Protectorate in the Pacific, and Japan Seized the Germany Protectorate in China and Asia, the British force siege the Germany Protectorate in North and South Africa.
Central African Nation involvement since Darfur Expedition in 1916 while South Sudan joined late 1916.
Ottoman involvement in 1914 means the war was brought to Asia Minor as early as that, Battle of Tsingtao by Japan mean war are happening in Eastern Asia as well in November 1914.
Russia Front was engaged since Balkan Campaign. Hence it was started in 1914 as well.
US join WW1 in 1917, in 1916, WW1 had seen action in Eastern Europe, Central Europe/Balkan, Western Europe, Asia Minor (Middle East), East Asia, Pacific, North Africa, Central Africa, Eastern Africa. The only place untouched by WW1 by the time US joined is North and South America, and Central Asia.
WW2 started with Germany Invade Poland, and Japan invade China, Soon enough in 1940, France and Belgium Campaign seen war in Western Europe, Expanding Eastward to Russia in summer of 1940, Japan expand Southward in 1940.
North African front was initiated by Italy in December 1940, Greece in Jan 1941, Malta in 1940. Balkan (Bulgaria and Yugoslav) joined the war in march 1941, At the same time, War brought into Iraq by commonwealth in May 1941.
US joined WW2 in December 1941, by then, the only expansion on both theatre is the Pacific Campaign. which actually started by the Japanese.
Now do tell me how US internationalize WW1 and WW2??
Korea started with north Korea invading South Korea, US did not start the war.
Vietnam War started with French and Indochina supporter in Viet Minh as early as 1955. US was a part of the conflict after French request US intervene.
First Iraq war was started when Iraqi invade and occupied Kuwait, US drove off Iraqi force in Kuwait by hooking west from Saudi Arabia.
You can claim the only 2 war the US started is Second Iraq war and War in Afghanistan. But did it actually internationalize any war during and before that time??
