This provision was enacted by the United States Congress to prohibit broadcasting studios in the U.S. from being connected by live telephone line or other means to a transmitter located in Mexico.
Although the original purpose of the Brinkley Act was to shut down XERA, subsequent Mexican-licensed stations have successfully used its provisions to carry American-originated programming.
It later affiliated with Fox upon that network's founding in 1986, again receiving Section 325 approval to carry live programming starting in 1994.
Today, especially after language requiring the FCC to consider whether it was "possible or desirable" for an American-licensed station to carry the requested programming was removed by the 1994 North American Free Trade Agreement, such permits are granted as a matter of course.
In recent years the law has returned to prominence, as its provisions have been used to extend US ownership limits to Mexican stations leased by US broadcasters.