Americans have many norms that confuse people in other countries. For example, we insist on having ice in our beverages. Americans think coins are basically worthless, and only to be used as 'spare change' for the homeless. We wear shirts with words on them: "I'm with stupid." But perhaps the most confusing thing Americans do is use a driver's license for all personal identification.
Sadly, after multiple failures to pass, a watered-down version of the REAL ID ACT ended up becoming a law in 2005. Instead of issuing all citizens a national ID card, individual state driver's licenses will still be used to board a plane. However, the government is requiring that states adhere to stricter codes and regulations to insure TSA agents get the information on passengers they need. So residents of twenty states, including California and New York need to go to a DMV to get a new card. But don't rush. This week, Congress extended the deadline to October of 2020 to get the new, enhanced driver's license.