Which technology was most important in ending world war ii

The invention of the Atomic bomb was the most important for the ending of WW2, it was dropped by the US and they named it "little boy". The first Atomic bomb was dropped in Hiroshima (Japan) and killed over 90,000–146,000 people

The second atomic bomb dropped in Nagasaki (Japan) killed over 39,000–80,000 people 

Hope this helps!!

Well the Atomic bomb  it was dropped on hiroshima and the submarines 

B. dawes commission