U.S. citizens are exempt from the eTA requirement and must carry proper identification such as a valid U.S. passport.
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The UK Electronic Travel Authorization is a new visa waiver for non-visa nationals. Although Americans do not need to apply for the ETA yet, they will need to in the coming years.
Travellers who are exempt from the eTA requirement.U.S. citizens are exempt from the eTA requirement and must carry proper identification such as a valid U.S. passport. Lawful permanent residents of the United States who hold valid status in the U.S. are exempt from the eTA requirement.
American Visa UK: What can you do? Because Americans are known as non-visa nationals in the UK, to answer the question do American citizens need a visa for UK? They don't. American citizens are able to visit for up to six months without a visa.