A serious message to all Americans:
Start planning for the worst. Buy and learn how to use a firearm. Get all your passports and documentation up to date and on hand in case you need to flee. Do not give them an excuse to deny your exit from the States as they will do this if your papers aren't all in order. Save up money in a foreign currency, learn a second language if you only know English.
Do whatever you need to do in order to be able to flee the country. It might sound like fear mongering, but it is better to be safe than sorry.