Why most Americans don't travel outside the US

Josh started a new job 5 weeks ago. After one year of employment he will get one (1) week of holiday. After 3 years of employment he will get two weeks of holiday. After 10 years, three weeks. Whoop-dee-doo. He does not even get any personal days. He has to find someone to cover his shift if he needs a day off. Even then they ask if he can be on call.