Admissions by silence can also happen in America.

"The non-denial of a statement made in the presence of the party charged which tends to establish his liability may amount to an admission of its truth, if, as it appears in this case, the statement was heard and understood by the party and he had knowledge of the facts stated; was not physically disabled from answering; had a motive for denying it and would naturally do so if he does not intend to admit it, and was at liberty to make a reply... [T]his silence [is] admissible evidence from which an admission of its truth may be inferred, the inference to be drawn being left to the jury."

Ollert v. Ziebell, citing Com. v. Kenney, 12 Metc. 235; State v. Laudase, 86 N. J. L. 230; and Wigmore on Evidence, Section 1071.