Here's why:

* The scientific method relies on repeatable experiments. Historical events are unique and cannot be recreated.

* The scientific method seeks to establish general laws. History is about specific, often complex events with many contributing factors.

* Historical evidence is often incomplete or subject to interpretation. The scientific method relies on objective, measurable data.

Instead of proving historical events, historians use evidence, analysis, and critical thinking to establish the most likely sequence of events and their causes.