Political Polarization in the West

‘A Perfect Storm for the Ambitious, Extreme Ideologue’
https://www.nytimes.com/2023/09/20/opinion/populism-polarization-trump-europe.html
 
Cross-Country Trends in Affective Polarization
https://scholar.harvard.edu/sites/scholar.harvard.edu/files/shapiro/files/cross-polar.pdf