Why Europe has forty-four countries.

There is no geographic reason for there to be forty-four countries in Europe rather than, say, six or four hundred. The current map is the result of five specific moments where someone redrew the lines, sometimes around a table, sometimes around a battlefield, and the new lines stuck.

A friend once asked me why Belgium exists. He meant it in the slightly impatient way someone uses when they have just lost a points round on a pub quiz, but it is a fair question. There is no Belgian language, no Belgian river that defines a Belgian valley, no Belgian climatic zone. The country is, depending on how charitably you look at it, two-and-a-half cultural regions stapled together in 1830 because the Great Powers of the day did not want either France or the Netherlands to control the mouth of the Scheldt. The borders were drawn at a conference in London. They are still there.

Belgium is one of forty-four answers to the same kind of question. Why does this country exist here, in this shape, with this name? The answer is almost never a clean line you can draw with a finger across a topographic map. It is a treaty, or a war, or in a few cases both. What follows is a short history of the European map in five moments — five times when a generation of statesmen sat down (literally; the surviving paintings always show them seated) and decided that the borders were now this. The map you carry in your head is the residue of those five sittings.

PIVOT ONE — 285 CERome splits in two, and Europe inherits a fault line.

The first pivot is the easiest to miss because no European country existed yet in the modern sense. In 285 the emperor Diocletian, weary of running the Roman Empire as a single bureaucratic unit, divided it administratively in half: an eastern half ruled from Nicomedia (later Constantinople) and a western half ruled from Milan, later Ravenna. The dividing line ran roughly through what is now the western Balkans — down through Albania, across what is now Bosnia, and out into the Adriatic.

That line is older than every country still on the European map. And remarkably, it is still there. You can trace it in the religious geography (Catholic west of the line, Orthodox east), in the alphabet (Latin script west, Cyrillic east in places), and in the legal and architectural traditions of cities. Modern Albania, Kosovo, North Macedonia, Bulgaria, Romania, Greece — these are sitting on or near the line Diocletian's secretaries drew up. When Yugoslavia broke apart in the 1990s, several of the new borders ran along it.

So before any other European country exists, there is already a north-south crease running through the centre of the continent. Everything that follows takes place against that crease.

PIVOT TWO — 1648Westphalia invents the country.

For the next thirteen centuries, "Europe" is not a stable map. The Holy Roman Empire is a quilt of more than three hundred semi-autonomous principalities and bishoprics. The Habsburgs and the French claim slices of the same territory at the same time. There are dozens of city-states. There is no Germany, no Italy, no consistent rule about what counts as a "country" rather than a "duchy" or a "free city" or a "personal possession of a prince."

Then in 1648 the Thirty Years' War ends. The treaties signed in two German towns — Osnabrück and Münster, collectively called the Peace of Westphalia — do something quietly revolutionary. They establish the principle that a political unit on the European map is sovereign within its borders, that other rulers cannot intervene in its internal affairs, and that the religion of the ruler determines the religion of the population. The unit on the map is now called a state. The state has territory. The territory has borders.

Westphalia does not give us the modern country count. It gives us the modern idea of a country. The German principalities are still numerous — there are more than three hundred at this point — and Italy is still a collection of separate states. But now they are countable. They have borders. The next two pivots will reshuffle them.

PIVOT THREE — 1815Vienna consolidates.

After Napoleon, the powers that beat him meet in Vienna in 1815 to put Europe back together again. The Congress of Vienna is the first time someone explicitly tries to draw a map for the whole continent at once. The participants are Austria, Russia, Prussia, Britain, and a defeated France that is allowed in because Talleyrand is too clever to be excluded.

The most important thing they do is consolidate. Three hundred-plus Holy Roman states become the Deutscher Bund — a German Confederation of thirty-nine. The Italian peninsula is grouped into nine. The Netherlands and Belgium are merged into a single Kingdom of the Netherlands. Norway is detached from Denmark and given to Sweden. The Habsburg empire absorbs Lombardy and Venetia. Poland is partitioned, again, this time formally.

Most of the borders we recognise today are not here yet. There is no Germany, no Italy, no Czechoslovakia, no Yugoslavia. Belgium is not yet independent — it will revolt and separate in 1830. But the principle of "a smaller number of bigger states" is now baked into European diplomacy, and the next century will push it hard. Italy unifies between 1859 and 1871. Germany unifies in 1871, after Bismarck has finished outmanoeuvring everyone. Belgium leaves the Netherlands. Romania emerges. The continent ends the 19th century with maybe twenty-five countries on it, depending on how you count.

PIVOT FOUR — 1919Versailles invents most of the rest.

The First World War ends with three multi-national empires collapsing: Austria-Hungary, the Ottoman Empire, and the Russian Empire (the last replaced by a Bolshevik state that takes back most of the territory under a different name). At the Paris Peace Conference, mostly at Versailles, the victors carve up what is left.

This is the single most generative moment for the current European country count. Out of the Austro-Hungarian carcass come Austria, Hungary, Czechoslovakia, Poland (restored after a century of partition), and large additions to Romania, Italy, and Yugoslavia (a new country, then called the Kingdom of Serbs, Croats and Slovenes). The Baltic states — Estonia, Latvia, Lithuania — emerge from the Russian collapse. Finland declares independence from the same. So does Iceland from Denmark (in stages, finishing in 1944). So does Ireland from the United Kingdom.

Most of the countries on the modern European map exist in some form by 1925. They will be lost and regained — Poland and the Baltics will disappear into the Soviet Union and re-emerge in 1991, Czechoslovakia will split into two in 1993, Yugoslavia will fracture into seven between 1991 and 2008 — but the basic territorial logic, "one historical nation, one country, one capital", is set in 1919.

PIVOT FIVE — 1991The Soviet Union dissolves and the map fragments again.

The fifth pivot is recent enough that many readers remember it. In 1991, the Soviet Union dissolves. Fifteen successor states are born. Of those, six are unambiguously European — Estonia, Latvia, Lithuania, Belarus, Ukraine, Moldova — and three more are partly European depending on the convention you use (Russia, Kazakhstan, Azerbaijan are all trans-continental, though Kazakhstan is counted as Asian by most cartographers and Russia and Azerbaijan as European).

Yugoslavia is dissolving at the same time. Slovenia and Croatia declare independence in 1991. Bosnia and Herzegovina follows, then Macedonia (later North Macedonia, after a long argument with Greece about names), and the rump Serbia-Montenegro federation eventually splits in two in 2006. Kosovo declares independence in 2008. Czechoslovakia, in what is now wistfully called the Velvet Divorce, becomes the Czech Republic and Slovakia in 1993.

By the early 2000s, Europe has gained about a dozen countries it did not have at the start of the 1990s. The forty-four-country figure we use today is mostly the consequence of these two parallel breakups — the Soviet one and the Yugoslav one — happening at the same time.

So, what number is the answer?

At GuessGlobe we settle on forty-four European countries, and the choice deserves a quick justification because every alternative answer is also defensible.

The figure includes the forty-three full UN member states whose territory is wholly or mostly in Europe — from Albania alphabetically through to the United Kingdom — plus Vatican City, which is a UN non-member observer state with all the usual diplomatic trappings of a country. It does not include Kosovo (recognised by about half the UN, but not a UN member), and it does not include the four trans-continental states whose European share is debatable: Russia (about 23 per cent in Europe), Turkey (about 3 per cent), Kazakhstan (about 14 per cent), and Azerbaijan (a sliver in the Caucasus).

Add Kosovo and the four trans-continentals back in and you reach forty-nine or fifty. Subtract the Vatican because you do not believe a city-state with no army or population is a country, and you have forty-three. Include Cyprus as European rather than Asian (most people do, geographically it is closer to Asia) and you can argue forty-five. You will find every number between forty and fifty in published atlases. They are all defensible. They are answering slightly different questions.

What the five pivots tell you is that the answer was never going to be a round number. The European map is the leftover of fifteen centuries of arguments. It is constantly almost finished and never quite. The Catalans want to redraw it, the Scots are debating whether to, the Faroe Islands are still wondering whether to leave Denmark formally, and Northern Ireland's status was the trickiest single problem in the Brexit negotiations. There will probably be more countries on the European map in 2050 than there are now. The mechanism that produced the forty-four has not stopped running.

If you can place all forty-four on a globe, you understand more about Europe than most adults who grew up there. Practise them, country by country, in GuessGlobe's Europe quiz mode. We pulled the capital answers from the same sources cited above; our detailed capitals walk-through goes through the mnemonics for the harder ones, and the enclaves piece covers the legacy oddities — Llívia, Büsingen, Baarle-Hertog, Campione — that this essay deliberately skipped past.