→ Since they are not considered ‘foreign’, the only countries’ passports with which someone can enter the US, for an indefinite period, without any kind of visa or permission are:

• Marshall Islands[1]

• Micronesia, Federated States of[2]

• Palau[3]

(By Source (WP:NFCC#4), Fair use, File:Palauan passport.jpg - Wikipedia)

• United States of America

→ Two more countries’ citizens don’t need visas to the US, for short visits and some other specified reasons[4]:

• Bermuda

• Canada

(By Source, Fair use, File:Canadian ePassport Cover (2013).JPG - Wikipedia)

→ Nationals of ALL other countries need a prior permission to enter the US: either through a visa, or in case of VWP[5] nationals for a short visit (90 days) - an ESTA[6] authorization.
VWP nationals are exempted from an ESTA, for short visits, only if they are entering the US by land.