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Main credit counts each entry once, for the country where the work was done. Any credit also counts entries a country shares with others, so those totals overlap.

With line color set to government type, each highlighted line changes color when that country's government changed. For Germany from 1949 to 1990 the color shows West Germany; East German entries are classed as communist in the government-type view.

The counts measure this database, so they also reflect how well each country's history is documented, not only what it achieved. Hover a line to read its value; click any line to highlight it.

Each entry is classed by the government in power where and when the work was done. The class comes from a timeline of each country's main regime periods, refined by the historical state named in the entry (so Soviet work counts as communist, and Venice or Florence as republics). The classes are deliberately broad:

Borderline cases follow simple rules. "Democracy" requires competitive elections with at least near-universal male suffrage, so Britain counts from 1918, the United States from 1828 and France's Third Republic from 1870; later extensions of the vote to women or minorities are not separate steps. Self-governing settler colonies such as 19th-century Australia are classed by how they were governed. Recent changes in regime quality are only coded where elections stopped being competitive. Treat the shares as approximate.