The US does have laws against deceptive advertising; whether they get enforced is another matter.
From the FTC site:
WHAT TRUTH-IN-ADVERTISING RULES APPLY TO ADVERTISERS?
Under the Federal Trade Commission Act:
- Advertising must be truthful and non-deceptive;
WHAT MAKES AN ADVERTISEMENT DECEPTIVE?
According to the FTC's Deception Policy Statement, an ad is deceptive if it contains a statement - or omits information - that:
- Is likely to mislead consumers acting reasonably under the circumstances; and
- Is "material" - that is, important to a consumer's decision to buy or use the product.