Upvote:2
This is actually part of a larger phenomenon -- in general, Europe is less unified politically than other parts of the world. China, for example, was a single empire for much of its history, often with a population greater than Europe's. India since about 1500 had one empire that controlled much of it.
In Europe, the losing side in a war was often not absorbed by the winning side, and sometimes the outcome of a war was the creation of more countries, i.e. WW1.
In recent decades, the already-large number of countries became even bigger as Yugoslavia, the USSR and Czechoslovakia all split up.
Various arguments have been made for why this is so. One was the influence of the Pope, and his independence from any State. By contrast, in other parts of the world, the political authorities often were also the religious authorities.
Another reason that has beens given is the geographic disunity of Europe. Water and mountains naturally divide it up into a lot of regions, with pieces such as Britain, Ireland, Scandinavia, Iberia, and Italy that don't naturally fit into another piece.
Upvote:7
In the case of Luxembourg, the country's independance was established during the early 19th century because of the strength of its main fortress in the capital, Luxembourg-ville.
But not so because some fierce nationalists would have used the fortress to defend the country against imperialist invaders. Rather because the fortress was such a huge advantage for whoever controlled it, that giving full sovereignty to either France, The Netherlands or Prussia/Germany would have been a threat to the security of the other two.
The balance of powers was considered during the 19th century, and possibly untill WWII, as the main garantee for peace. This concept drove the European policy of UK, and of some continental leaders like Metternich. As a consequence, the Congress of Vienna (1815), the first Treaty of London (1839) and the Second Treaty of London (1867) gradually led to the small, independant country of Luxembourg, and to the dismantlement of its capital's fortress - to make sure no imperialist power would take advantage of it.
Remaining neutral for the next 150 years must have helped Luxembourg to maintain or recover its independance ever since, even if it has not prevented its occupation by Germany during both World Wars.
Upvote:9
Every country in the world has its own history. In Medieval Europe there were hundreds and possibly thousands of small states, most of which were more or less subordinate to larger states that in turn were more or less subordinate to still larger states, and so on.
In the later middle ages and modern times rulers of powerful states sought to gain more and more control over their subordinate states and to conquer small states that were not subordinate to them.
So after about 500 or 600 years of history the map of Europe is mostly composed of large countries whose members mostly speak the national language and feel like members of the national ethnic group. The large (but not total) coincidence between ethnic groups and national borders is due to the efforts of national governments to convert all members of ethnic groups within their borders to members of the national ethnic group.
So the few tiny countries remaining in Europe are the remnants of the large number of former countries that once existed in Europe, the survivors that were not annexed by larger countries.