The word 'polarization' is on the lips of every commentator today, from mainstream journalists to the left, but the significance of this widely recognised phenomenon needs far more scrutiny than it has had. The 58th volume of the Socialist Register takes up the challenge of exploring how the new polarisations relate to the contradictions that underlie them, and how far 'centrist' politics can continue to contain them. Original essays examine the multiplication of polarised national, racial, generational and other identities in the context of growing inequality in income and wealth, new forms of regional and urban antagonism, 'vaccine nationalism', and the shifting parameters of great power rivalry.