Premise: In those countries where dialect study is undertaken, dialectologists observe that there are today many factors militating against the strict maintenance of older dialect  the standardization of terminology as adopted by national periodicals, news services, radio, and television; the establishment of  prestige  dialects and, through the media, their promulgation; and the huge population shifts that have taken place, particularly in the U.S. since WWII.

Hypothesis: Outside of the U.S., this phenomenon is most prominently seen in the other countries involved in WWII.
Relation: neutral