So far, this is the earliest story I’ve read with the thought that a minuscule change in the past can cause major changes to our time. The setting is a press conference where the Secretary of Security presents the time-travel device to twelve reporters.
The traitorous Shayson and his illegal federation extended this hypothesis to include much more detailed and minor acts such as shifting a molecule of hydrogen that in our past really was never shifted.

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  1. “Brooklyn Project” by William Tenn, in Planet Stories, Fall 1948.
    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . written by William Tenn