population playback

How this is counted

Two things on this site need explaining, because both involve judgement that the numbers alone hide: what happens when a country's borders change, and what exactly each country group means.

Borders that changed: Russia, the USSR, and the rest

Play back to 1950 and Russia shows about 103 million people — not the roughly 179 million the Soviet Union had at the time. That is not an error, and it is the single most important thing to understand about this data.

The packaged series comes from the UN World Population Prospects, which reports every country on the territory it occupies today, projected backwards through history. The 1950 figure for Russia is “how many people lived inside today's Russian borders in 1950” — the RSFSR, not the whole USSR. The same convention applies everywhere:

The practical upshot: every line on this site is a fixed patch of ground measured over time. Nothing appears or disappears when a state is founded or dissolved, because the geography never changes — only the people on it do.

Where this is imperfect

Country groups

Groups let you play a bloc rather than a single country. A group's population is the sum of its members' present-day territories — the same convention as above, so a group is also a fixed patch of ground. Selecting a group also narrows the leaderboard to its members.

Not all groups are equally solid, so each one is tagged:

defined
Membership is fixed by a treaty, charter or constitutional fact and can be checked against the named authority. Little room for argument.
ranked
Membership is computed at build time from a pinned external dataset (the World Bank). It changes when that source is refreshed, and the ranking metric matters — see each group's note.
editorial
No authoritative roster exists. The criteria are this project's own and the membership is a judgement call. Treat these as an informed sketch, not a fact.

The industrial groups — cars, aircraft, ships, computers — are all in the last category. There is no official list of “countries that build aircraft”, and any line drawn will be arguable: a country may design and build complete airframes, or merely assemble someone else's under licence, and the same word covers both. The computer one is weakest of all, because design, chip fabrication and final assembly happen in different countries and no single one of them is “the industry”.

Every group's exact definition, source and member count is listed below, generated from the same packaged data the site plays — so this page cannot drift out of sync with what the picker actually does.

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