If you had to pick one invention being the most important in history, which would you pick?

invention of electricity

considered the turning point in pacific war. the japanese tried to lure the american navy out so it could be destroyed but failed. the americans were led by admiral chester nimitz. the victory by america would put them on the offensive for the remainder of the war.

which time period is this? or is this story fictional, i'm going to need more info to answer this question