My Strangest Talent

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Today's challenge is my strangest talent.
I can foretell the future. It also makes me a Casandra.
It's not a talent per se, but training in my subject field. I'm a historian, fancier word for history teacher.
What's the importance of history? It's how you tell the future. Examples: Why do lending institutions want your credit history? It tells them what your credit future will be. Insurance companies want your medical history, it tells the actuarial tables how long you will live.
Here's the problem with being able to foretell the future: there's nothing you can do to change it. You see what's going to happen and yell at the top of your voice or post numerous blogs telling everyone that no matter how big and powerful an empire becomes they will always lose a logistical war. It's only a matter of time before they realize this and pull out leaving their economies in tatters.
Examples: Rome fighting against Parthia. The Crusades. The American Revolution. Vietnam, England invading Afghanistan in the 1800's. Russia invading Afghanistan in the 1980's. The United States invading Afghanistan and still fighting there even though troops going over there weren't even born when it started.

You know how Cromwell became dictator of England, you know how Napoleon became dictator in France, Hitler, Mussolini, Franco, and now watching Trump. It gets frustrating.