In the UK policy is shaped by different means. For example - 1. Think tanks pushing an idea. 2. Party conference voting on election promises. 3. Recommendations following public enquiries. 4. Bribing the government to pass laws that you like. 5. Politicians of all parties working together to improve things. OK , I made the last one up. So where do US policies come from ? I was struck by two policies put forward by the President recently. Arming teachers and imposing tariffs. Neither seem to be universally popular and I cant find any science backing them up either. They seem to be a bit off the cuff. Im not looking for trump abuse here or Obama abuse either. Neither do I want arguments pro and con these two measures. Just an understanding of how these ideas get to be the thing.