In 1990 only around 3% of the US population had a passport[1]. These days it's up to 42% due to a combination of stricter ID requirements (particularly at the C

In 1990 only around 3% of the US population had a passport[1]. These days it's up to 42% due to a combination of stricter ID requirements (particularly at the Canadian and Mexican borders) and an increase in popularity of international travel among Americans in general. [1]: https://www.forbes.com/sites/niallmccarthy/2018/01/11/the-share-of-americans-holding-a-passport-has-increased-dramatically-in-recent-years-infographic/#16df3a7b3c16 https://www.forbes.com/sites/niallmccarthy/2018/01/11/the-sh...