It was 20 years on May 23rd, 1994 that Fox bought the stations of New World Communications which resulted in some major CBS affiliates switching to Fox causing a major realignment in America's broadcasting industry.
Background: As you may remember back in 1993, Fox bought the NFL's NFC Package from CBS for a whopping $395 million a year for 4 years. CBS, which was led at the time by the cost-cutting CEO Laurence Tisch, only offered $290 million a year and was unwilling to match Fox's offer. Thus Fox would begin broadcasting the NFC games in the '94 season. Problem for Fox was, while they had some affiliates, they were mostly low-powered UHF stations that not a whole lot of people knew, therefore, Fox wanted to switch to stations that people were more familiar with. By acquiring the New World stations, Fox would have achieved this goal mostly since most of those stations were in markets that had an NFL team in the NFC.
Problems for CBS in Detroit: Nobody was watching CBS in the '90s because their programming was skewed to an older audience and the ratings were at an all time low. This made in difficult for CBS to get new affiliates, especially in Detroit. In a deal just mere days before its old affiliate WJBK would switch to Fox, CBS struck a deal with to acquire the small independent station WGPR-TV on channel 62 for $24 million. The offer was more of a desperation for CBS than what the station was worth. CBS would have preferred to make a deal with WADL, channel 38, but the owner of that station, Kevin Adell made unreasonable demands. With Scripps renewing an affiliation deal with ABC, WXYZ was out of the question. WDIV wasn't interested because NBC was doing great at the time. The former Fox station on channel 50, WKBD, was about to become part of the "new" UPN and WXON on channel 20 (now WMYD) was going to be part of the WB. So CBS was stuck with WGPR and therefore when the switch happened, the ratings dropped dramatically. CBS invested a lot of money in the new station (which is now called WWJ-TV) and the ratings for CBS in Detroit would slowly pickup again (but still nowhere near what they were on WJBK).
Today: Today (as of this writing) CBS is the #1 network in the country (but not without getting the AFC package from NBC back in '98) and FOX is currently in 3rd place. The NFL is the #1 league in the country with CBS, Fox and NBC paying $1 billion a year each for TV Rights plus $1.9 billion a year from ESPN. Meanwhile CBS ratings in Detroit today are only about half of what they were when CBS was on WJBK. The station still can't compete on local news against WJBK, WDIV, and WXYZ. (Although ironically, CBS also owns WWJ-AM which is the #1 news radio station in Michigan) WMYD just announced recently they'll get acquired by Scripps (who also owns WXYZ), WKBD is now a CW station and is also owned by CBS while WADL remains an independent and WDIV remains with NBC.
So there's an overview of what happened in the Detroit market because of this realignment. Please feel free to share your experience.
http://en.wikipedia.org/wiki/1994_United_States_broadcast_TV_realignment
http://en.wikipedia.org/wiki/WWJ-TV
http://en.wikipedia.org/wiki/WJBK
http://en.wikipedia.org/wiki/WXYZ-TV
http://en.wikipedia.org/wiki/WKBD
http://en.wikipedia.org/wiki/WMYD
Background: As you may remember back in 1993, Fox bought the NFL's NFC Package from CBS for a whopping $395 million a year for 4 years. CBS, which was led at the time by the cost-cutting CEO Laurence Tisch, only offered $290 million a year and was unwilling to match Fox's offer. Thus Fox would begin broadcasting the NFC games in the '94 season. Problem for Fox was, while they had some affiliates, they were mostly low-powered UHF stations that not a whole lot of people knew, therefore, Fox wanted to switch to stations that people were more familiar with. By acquiring the New World stations, Fox would have achieved this goal mostly since most of those stations were in markets that had an NFL team in the NFC.
Problems for CBS in Detroit: Nobody was watching CBS in the '90s because their programming was skewed to an older audience and the ratings were at an all time low. This made in difficult for CBS to get new affiliates, especially in Detroit. In a deal just mere days before its old affiliate WJBK would switch to Fox, CBS struck a deal with to acquire the small independent station WGPR-TV on channel 62 for $24 million. The offer was more of a desperation for CBS than what the station was worth. CBS would have preferred to make a deal with WADL, channel 38, but the owner of that station, Kevin Adell made unreasonable demands. With Scripps renewing an affiliation deal with ABC, WXYZ was out of the question. WDIV wasn't interested because NBC was doing great at the time. The former Fox station on channel 50, WKBD, was about to become part of the "new" UPN and WXON on channel 20 (now WMYD) was going to be part of the WB. So CBS was stuck with WGPR and therefore when the switch happened, the ratings dropped dramatically. CBS invested a lot of money in the new station (which is now called WWJ-TV) and the ratings for CBS in Detroit would slowly pickup again (but still nowhere near what they were on WJBK).
Today: Today (as of this writing) CBS is the #1 network in the country (but not without getting the AFC package from NBC back in '98) and FOX is currently in 3rd place. The NFL is the #1 league in the country with CBS, Fox and NBC paying $1 billion a year each for TV Rights plus $1.9 billion a year from ESPN. Meanwhile CBS ratings in Detroit today are only about half of what they were when CBS was on WJBK. The station still can't compete on local news against WJBK, WDIV, and WXYZ. (Although ironically, CBS also owns WWJ-AM which is the #1 news radio station in Michigan) WMYD just announced recently they'll get acquired by Scripps (who also owns WXYZ), WKBD is now a CW station and is also owned by CBS while WADL remains an independent and WDIV remains with NBC.
So there's an overview of what happened in the Detroit market because of this realignment. Please feel free to share your experience.

http://en.wikipedia.org/wiki/1994_United_States_broadcast_TV_realignment
http://en.wikipedia.org/wiki/WWJ-TV
http://en.wikipedia.org/wiki/WJBK
http://en.wikipedia.org/wiki/WXYZ-TV
http://en.wikipedia.org/wiki/WKBD
http://en.wikipedia.org/wiki/WMYD