What happened in the 1880s?
📬 Universal Postal Union Treaty Revised (1885): Streamlining global mail delivery.
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Further Reading
What Changes to the Universal Postal Union Treaty Mean for Your ... (redstagfulfillment.com)
UNIVERSAL POSTAL UNION - United Nations Treaty Collection (un.org)
Streamlining global airmail: airlines and postal services strengthen ... (upu.int)
Universal Postal Union (loc.gov)
Universal Postal Conventions and Regulations (upu.int)
Transnational Influence: Development of United States Parcel Post ... (usps.com)
United States to Remain in the Universal Postal Union (naps.org)
International Postal Policy - State.gov (state.gov)