One of the most overlooked, yet most significant innovations of the early 20th century might be the Post Office's decision to start shipping large parcels and packages through the mail. While private delivery companies flourished during the 19th century, the Parcel Post dramatically expanded the reach of mail-order companies to America's many rural communities, as well as the demand for their products. When the Post Office's Parcel Post officially began on January 1, 1913, the new service suddenly allowed millions of Americans great access to all kinds of goods and services. But almost immediately, it had some unintended consequences as some parents tried to send their children through the mail.
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