Assertion: u.s.'s history | /r/HasAspect | pre-paid letters
Facets:
Source sentences:
text: The history of postal service of the United States began with the delivery of stampless letters, whose cost was borne by the receiving person, later also encompassed pre-paid letters carried by private mail carriers and provisional post offices, and culminated in a system of universal prepayment that required all letters to bear nationally issued adhesive postage stamps.