Review article. Voice in global English: unheard chords in crystal loud and clear. David Crystal

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Abstract
The story of English throughout the period is one of rapid expansion and diversification, with innovation after innovation coming to use the language as a primary or sole means of expression. It is not possible to identify cause or effect. So many developments were taking place at the same time that we can only point to the emergence, by the end of the nineteenth century, of a climate of largely unspoken opinion which had made English the natural choice for progress.