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1. https://www.pewresearch.org/the-american-trends-panel/

2. The relationship between health and political ideology begins in childhood

3. The Psychology of Online Political Hostility: A Comprehensive, Cross-National Test of the Mismatch Hypothesis

4. Twitter use in the everyday life: Exploring how Twitter use predicts well-being, polarization, and sense of belonging

5. Current research overstates American support for political violence

6. Feeling Good Is Feeling Better

7. The delusive economy: how information and affect color perceptions of national economic performance

8. Overperception of moral outrage in online social networks inflates beliefs about intergroup hostility

9. Did Cooperation Among Strangers Decline in the United States? A Cross-Temporal Meta-Analysis of Social Dilemmas (1956–2017)

10. The Psychophysiology of Political Ideology: Replications, Reanalyses, and Recommendations

11. Wikipedia Bibliography:

    1. https://en.wikipedia.org/wiki/Political_polarization  :

       https://en.wikipedia.org/wiki/Political_polarization

    2. https://en.wikipedia.org/wiki/Political_polarization_in_the_United_States  :

       https://en.wikipedia.org/wiki/Political_polarization_in_the_United_States

    3. Structural equation modeling

    4. Pew Research Center  :

       https://en.wikipedia.org/wiki/Pew_Research_Center