This is the map of Europe from 1914.,right before the world war I.,with few exceptions only because of the balance of the powers in the game.
Luxemburg is missing here but it was independent,the same as Montenegro which is between Albania and the south-east border of Austria (Habsburg Monarchy). Denmark owned Iceland (untill 1918),Russia owned Finland and Poland,the same as Baltic states and France owned Tunis,the same as Algeria and Morroco (except the Tanger region owned by Spain).
There are some changes about neutrals - Swe,Nor,Den,Hol and Spa were neutrals but Portugal,Belgium,Serbia,Greece and Bulgaria made part of the "Triple Entente" (Fra,Eng,Rus) together with Italy (which stabbed Germany and Austria as the war started) and Bulgaria joined "the Central powers" (the bad guys - Ger,Aus and Ita originaly).
I don't remember about the bridge though...

* "...but Por,Bel,Ser,Gre and Rumania...". Sorry.

The bridge between Denmark and Sweden was build in year 2000, so it was def not there in 1914. However, the sea between is so narrow it can be crossed swimming. The Swedish army even crossed the ice once..

As for World War 1, you missed Rumania which was an ally. Also I would hardly argue that the entente were the good guys.

While it is true that the war started because Ferdinand was killed by Serbian terrorists, it is also true that tensions were rising preceding that assassination and it was only a matter of time before war started.

After the German unification, Britain and France feared the resulting shift in power and adopted efforts to contain her. This caused the increased tensions in Europe that would eventually lead to world war 1.

it is not set in the real world. It is a board game which approximates the power dynamics between different european empires, kingdoms and a republic.

It is set after the Napoleonic wars and before the first world war, before the new alliances have become set in stone - this allows a more flexible game. Flux is the basic idea....

"While it is true that the war started because Ferdinand was killed by Serbian terrorists, it is also true that tensions were rising preceding that assassination and it was only a matter of time before war started."

No, it is true that the excuse given for starting the war was Ferdinand being killed by Serbian nationalists - following the german and italian examples of forming a nation based on ethnic background. But the powers in europe at the time were in an unstable state, power was held by individuals and governments who saw war as a natural and desirable resolution - the european people largely didn't want war, and would likely have preferred a peaceful economic expansion and growth... (for example the Irish also had nationalist organisations forming in an attempt to achieve independence from the United Kingdom, totaling ~104,000 volunteers, 100,000 of them went to fight for 'the small countries' in the British army, 4,000 organised the 1916 easter rising, which was a complete military failure... I imagine that those 100,000 men would have been happy with a negotiated peace, considering the British parliament had passed a law guaranteeing Ireland home rule - and this was a big factor in them joining the war effort on the side of the British)

The borders can be dated to those between the Second Balkan War and the First World War, sans Montenegro, Luxembourg and the microstates.