The Santa fe trail is the answer!
Answer:
Wars
Explanation:
Since it's multiple choice it doesn't require one but here it is if you care to know,
Stable government is a reason to <em>stay</em><em> </em>so we can eliminate that
Lack of job opportunities is a reason to leave but its not as bad as wars and the same thing goes for shortage of food.
Hope I was of help,
You're friendly neighborhood struggling student
Toodles ✌