Henry Seidel Canby,
Definitions: Essays in Contemporary Criticism…
“ Radicalism, indeed, is its child. Political and religious radicalism brought the Pilgrims to New England, the Quakers to Pennsylvania; political and economic radicalism made the Revolution against the will of American conservatives; political and social radicalism made the Civil War inevitable and gave it moral earnestness. Radicalism, whether you like it or not, is much more American than what some people mean by "Americanism" to-day. ”
