Question: What began as a result of the size of the domestic market and the use of mass-production, that use's a radio station in metro Detroit as the primary provider of news involving it?

<P0-S0> WDET-FM is a public radio station in Detroit, Michigan. <P0-S1>  Licensed to Wayne State University in the city's Cass Corridor neighborhood, about a mile south of the New Center neighborhood, WDET broadcasts original programming and shows from National Public Radio, Public Radio International and American Public Media. <P0-S2>  It broadcasts on the FM dial at 101.9 MHz. <P0-S3>  The station serves Metro Detroit and is the primary provider of news involving the American automotive industry and Michigan politics within the NPR distribution network. <SEP> <P1-S0> The automotive industry in the United States began in the 1890s and, as a result of the size of the domestic market and the use of mass-production, rapidly evolved into the largest in the world. <P1-S1>  However, the United States was overtaken as the largest automobile producer by Japan in the 1980s, and subsequently by China in 2008. <P1-S2>  The U.S. is currently second among the largest manufacturer in the world by volume, with approximately 8-10 million manufactured annually. <P1-S3>  Notable exceptions were 5.7 million automobiles manufactured in 2009 (due to crisis), and peak production levels of 13-15 million units during the 1970s and early 2000s. <SEP> <P2-S0> WDFN is a sports-talk radio station in the Detroit, Michigan, market. <P2-S1>  It broadcasts in the AM radio band at 1130 kHz, which is a clear-channel frequency. <P2-S2>  WDFN is not considered a clear-channel station because of its Class B status. <P2-S3>  WDFN is owned by iHeartMedia, and until the end of the 2008-09 NBA season, was the flagship station for the Detroit Pistons. <P2-S4>  It is affiliated with Fox Sports, as well as MRN and PRN for NASCAR coverage. <P2-S5>  WDFN is one of several sports-talk stations in metro Detroit, the others being WXYT-AM (CBS Sports), WCAR (SB Nation Radio), and WXYT-FM ("The Ticket"). <P2-S6>  WDFN is the only one of the four sports stations that carries a significant amount of community programming and infomercials unrelated to sports. <SEP> <P3-S0> WHAD (90.7 FM) is a non-commercial radio station licensed to the western Waukesha County community of Delafield, Wisconsin and serving the Milwaukee metropolitan area, transmitting from south of Delafield. <P3-S1>  Part of Wisconsin Public Radio (WPR), it airs WPR's "Ideas Network", consisting of news and talk programming. <P3-S2>  Like the Milwaukee area's other NPR station, WUWM (licensed to Milwaukee proper), the station airs BBC World Service in the overnight hours. <P3-S3>  WHAD maintains a local news staff and cut-ins outside of the main WPR network, and the station's facilities, located on the seventh floor of 310 W. Wisconsin Avenue in Milwaukee (by coincidence, also hosting the studios of commercial sports radio station WAUK), originate some programming for the network, including Kathleen Dunn's afternoon program until her retirement in the summer of 2017. <P3-S4>  WHAD has its own 414 studio line for Milwaukee callers to call into locally originated programs. <P3-S5>  Because of the lack of a sister station providing WPR's News and Classical Network to Milwaukee, WHAD provides the HD2 Classical Network via HD Radio to the market via their HD2 subchannel, which only differs from the News and Classical Network in having a full-classical format overlaying NPR and APM news programming exclusive to WUWM in the market; it became the market's only classical music station over the air in 2007 after WFMR abandoned the format commercially.