Answer:
When did Stephen Austin come to Texas?
Explanation:
First, you think of either a subject or a date. Then, you see if anything happened on that date. If you do not know this, then you will have to research a bit. Lastly when forming your historical question, make sure that one of the pieces of information are missing in the question. However, you can ask for a piece of information. I did this in my example question.
