8. Just having a passport doesn't mean you won't get stuck at a border.

Personal Data CollectionPoliticsU.S. Department of State
Passports must have at least two blank visa pages. Many countries also require that your passport be valid at least three to six months after your date of travel. The rules vary by country. Check with the embassy of your destination country to confirm which rules apply to you. If you need... Gretchen Strauch