Read this excerpt from a passage. The Post Office Department served Americans until 1970 when it was reorganized as the United States Postal Service. By federal law, the USPS must provide mail service to all Americans regardless of cost or location For most of its 44-year history, the USPS tumed a profit and was financially self-sufficient (Gattoso). Americans relied heavily on the USPS to send and movive invitations, birthday greetings legal notices, bills, checks and even love letters. However, this all changed in 2007. Starting in 2007, a dramatic drop in demand sent the USPS over a financial cliff. Because of the rise of digital communication, Americans were simply no longer mailing cards, letters, flyers invitations, announcements, bills, statements, and solicitations as they had in the past. The volume of U.S. mail peaked in 2006 at 213 billion pieces, but in 2007 the numbers quickly began to drop. Since 2007, the total volume of all mail has dropped 25 percent and since 2001 the volume of first-class mail has declined by nearly one-third ("Pieces of Mail"}, What caused the rapid decline in the volume of first-class mail? The price of sending a piece of mail became too expensive for most Americans. Americans decided that they relied too heavily on the USPS to send and receive correspondence, so they stopped using their services. In 2007, the economy went over a financial cliff and people stopped using the USPS. The ability to communicate digitally caused a change in people's behavior: they no longer had to send correspondence by mail.