Recreating the civil war with the same, now dead, people would be easier. We don't need to do so for the theory to still be valid. When the day comes when evolutionary theory is complete perhaps we will have solutions to problems like the mutating, anti-biotic resistant bacteria. Come up with the facts and the predictions are simple computations. If not, then you are wasting your money.
Moths are an easy example because they reproduce so fast and are easily tagged for future recapture.
Try the experiment above as many times as you like. Also, the people who make this claim think that scientific theory is a mere untested, unobserved hypothesis. We both know that a scientific theory is far more than this. And keep asking the questions and actively looking for the answers.