Although language borders and political borders do not always agree, there have been many instances where political leadership has attempted to enforce language borders. In the Mexican city of Ciudad Juarez on the border with the United States, social efforts have been made to curb the amount of American influence taking place—but at the same time, as in other foreign cultures, the class benefits of English proficiency are acknowledged and to this end schools teach in English and many television channels are in English.[1][2] The use of Breton and Welsh has historically been discouraged by French and British governments respectively. There are also instances of intolerance to the speaking of Native American languages at some schools, thus forcing those students to create small communities in which they can speak their native language, thereby creating "language boundaries" on a very small scale.[3] Examples like these illustrate the impact that language boundaries can have on cultural boundaries, even if they are not necessarily one and the same.[4]