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Parcel post refers to a mail service specifically designed for handling packages and parcels. This service is a part of the broader postal system, which has evolved significantly over time. In the United States, the postal service expanded rapidly after independence, with key developments including the introduction of uniform postage rates, postage stamps, and free delivery services.12

Supplementary services, such as parcel post, were introduced in 1913, alongside options like collect on delivery (COD) and insurance. The postal system has adapted to various forms of transportation, from stagecoaches to airmail, and has seen advancements in mechanization and automation, including the use of ZIP codes for efficient sorting.2

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