Probably because of (1) tanks, (2) airplanes, and (3) more motor vehicles than ever before replacing horses. And more machine guns than before (although a type of machine gun existed at the time of the Spanish-American War in 1898).
Both the American Civil War and World War One have been called the First Modern War.
The First World War ( 1914 to 1918 ) was also called "The Great War " at the time.
the war to end all wars
The war to end all wars
the first name of the tank in world war I is called big bessy
becuase it was the first war that used mechanical instruments
World War I (WWI) or First World War (called at the time the Great War) was a major war centered on Europe that began in August 1914. The fighting ended in November 1918.
World War II is given the designation to differentiate it from World War I. The first war, also called the Great War, was 1914 to 1918, and the second was from 1938 to 1945.
Japan. It was not called World War 1 at the time. It was called The Great War. After World War 1, he went on a World Tour promoting peace. It was the first time a Japanese Emperor had ever left Japan.
World War II is given the designation to differentiate it from World War I. The first war, also called the Great War, was 1914 to 1918, and the second was from 1938 to 1945.
The First World War was a contributing factor to starting the Second World War, but for the Japanese and a part of China called Manchuria, to the west, the War started in 1931.
It was called the modern war because of new weapons such as machine guns advanced technology and etc