When proponents of evolution decided to make natural selection synonomous with evolution.
Creationists realised there was confusion in the general public (encouraged by the MSM) over the the difference between natural selection/microevolution (which can be observed, tested, etc.) and "macro" evolution,)which can't be observed, tested, because it supposedly occurs over periods of millions, or billions of years, which is beyond the lifetime of a person to observe and test.)
Finally, someone who may be able to answer my question. If natural selection can be observed and tested, what physical event or process, does natural selection explain, that isn't already explained by mutation, drift, recombination, and heredity.