Some historians call World War I the first industrial war. Several new technologies were developed for warfare. One of the most destructive new weapons used in WWI was

The atomic bomb
The cannon
The fighter jet
Poison gas

The assassination of Archduke Franz Ferdinand in 1914 set events in motion that led to World War I. However, no major war is ever caused by a single event. Another factor that contributed to the outbreak of World War I was

Laissez faire economics
The League of Nations
Intense nationalism
The Bolshevik Revolution

The most destructive ammunition used from the given ones in World War I is a poisonous gas.
Another factor which had led to the beginning of World War I was intense nationalism.

Who was Ferdinand?

Ferdinand was the king of Austria and Hungary during the times of World War I.

During World War I, the most dangerous ammunition were nuclear submarines, war-planes, military tanks, and poisonous gas or tear gas along with the machine guns, hand grenades, etc. of the military forces.

Apart from the murder of Ferdinand in the year 1914, there were some other factors that led to the starting of World War I. They were the practice of nationalism, imperialism, militarism, and the formation of alliances by the citizens of the country.

Therefore, during the times of WWI, poison gas was the most destructive weapon and nationalism was another factor that led to the starting of that war.

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