How powerful is your passport? Americans’ travel documents aren’t as muscular as they used to be

ANYONE WHO has stood in a long queue at border control, or bypassed one, knows that not all passports are created equal. Citizens of some countries can speed through the gates; citizens of others must submit to interrogation and delay. Henley & Partners, a consultancy that helps rich people acquire citizenship in attractive countries, ranks passports by the number of countries their holders can enter without a visa. Its latest assessment of passport power shows that America is sliding down the table. Our map below shows how countries compare this year. Asian countries dominate the top of the table. Singapore...