I think there was a revolution in poetry, associated chiefly with Eliot and Pound; but maybe it is of the nature of revolutions or of the nature of history that their innovations should later come to look trivial or indistinguishable from technical tricks. ↗
When the Industrial Revolution of the nineteenth century brought a rapid increase in wealth, the demand of workers for a fair share of the wealth they were creating was conceded only after riots and strikes. ↗