When a Butterfly Shakes History

Edward Lorenz's Butterfly Effect believes that when a butterfly flaps its wings in South America, it will trigger a storm on the other side of the earth. So if during the evolution of history, the original historical process deviates, and a few more or fewer people participate, will it still be the history we know well? What kind of changes will this kind of history have? Zhuang Zhou Mengdie, what is imagination and what is reality, or is it somewhere in between?