Data Sources
Rankings are drawn from these authoritative international organizations. Each entry in the Rankings table links directly to the source.
Primary Sources Used in Rankings
Publishes the Human Development Index, global poverty data, and numerous development indicators via UNDP.
Life expectancy, maternal mortality, infant mortality, disease prevalence, and global health spending.
The Organisation for Economic Co-operation and Development covers education (PISA), health outcomes, income inequality, graduation rates, poverty, and dozens of socioeconomic indicators among its 38 member nations.
Global Competitiveness Report, Gender Gap Index, and other global risk and competitiveness assessments.
The Stockholm International Peace Research Institute tracks global military expenditure, arms transfers, and nuclear weapons stockpiles.
Publishes the annual Corruption Perceptions Index, ranking 180 countries by perceived levels of public-sector corruption.
Produces the Global Peace Index, measuring the relative peacefulness of 163 countries using 23 indicators.
Annual ranking of national happiness based on Gallup polling, measuring life evaluations, positive and negative affect, and social trust.
Human Development Index combining life expectancy, education, and GNI per capita for 193 countries.
Global Innovation Index and patent application statistics across 133+ countries.
CO₂ emissions per capita, renewable energy share, energy consumption, and clean energy transition metrics.
Biennial ranking of 180 countries on environmental health, ecosystem vitality, and climate performance.
Annual Press Freedom Index for 180 countries, assessing the environment for journalism including political pressure, legal frameworks, and safety.
Democracy Index ranking 167 countries across five categories: electoral process, civil liberties, functioning of government, political culture, and political participation.
Comparative international incarceration rates published by the Institute for Crime & Justice Policy Research.
Monthly global internet speed data covering fixed broadband and mobile connections in 200+ countries.
Annual assessment of 67 countries' climate action, covering greenhouse gas emissions, renewable energy, energy efficiency, and climate policy.
Global Diabetes Atlas providing country-level diabetes prevalence, incidence, and health expenditure data.
Additional Reference Sources
The following sources are not directly cited in our rankings table but provide valuable supplementary data:
Development data on GDP, trade, poverty, and infrastructure across 200+ economies.
Annual Billionaires List with country-level data on extreme wealth concentration.
Comprehensive country profiles compiled by the U.S. Central Intelligence Agency.
UN Office on Drugs and Crime — global homicide data, drug use statistics, and crime metrics.
Comparative health system performance reports among high-income nations.
A useful aggregator of international comparisons, with citations to primary sources.
Primary Sources Used in Trends
The American Trends page tracks the U.S. against its own history using these long-running survey and administrative data series.
Decades-long tracking polls on American pride, confidence in institutions, trust in media, and satisfaction with the direction of the country.
Long-running series on trust in government (since 1958), trust in scientists, and interpersonal trust.
Since 1972, tracks core social attitudes including interpersonal trust ("most people can be trusted").
Annual labor union membership rate and other labor-force statistics, tracked since 1983.
Vital statistics including the U.S. marriage rate, tracked since the 1940s.