Afghanistan remains the weakest passport in the world, with visa-free access to just 27 destinations - 165 fewer than Singapore. It is followed by Iraq (29 destinations) and Syria (30 destinations).
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Countries in the Visa Waiver Program that can travel to USA visa-free:
Puerto Rico and the US Virgin Islands are two Caribbean countries that do not require a passport for American citizens when traveling by air or sea. Essentially, these countries are regarded as domestic travel within the United States.