Which of these (multi-regional) groups has the strongest group solidarity?

[Norbert]

I think Germanics do, but I could be wrong.

[Sikeliot]

Germanics, in my opinion.

[Wanderlust]

Germanics and Slavs.

[Laubach]

Celts, in my opinion!

[Foxy]

In reality, so out of Apricity, Spaniards and Italians deal very well. Here we don't but it's a surrealistic situation. We absolutely don't hate each others more than, to say, English and Germans.
And slavs, which solidariety do they have? They have killed each others until 10 years ago in the Balkans. As far as I can remember there has never been a serious war among two or more Latin countries...

[Hevneren]

Slavs maybe. They seem to have a pan-Slavic movement, and in Eurovision they always vote for each other. The Germanic countries don't do the same generally. We have some Nordic unity, but this isn't always the case either.

I'm not sure why people think Germanic peoples show solidarity. I think it's more in our nature to be independent and say "screw everyone else" than to band together. Germanic tribes have fought each other for centuries, and it was Germanic Anglians and Saxons who committed genocide on fellow Germanic Norse settlers in Britain. They've found mass graves of Norsemen killed by their English "cousins".

The German Nazis occupied Germanic countries and killed their "Germanic brethren" for power and resources.

[Oreka Bailoak]

I voted Latin because they seem to have the strongest family values in Europe (which goes hand in hand with group solidarity). The only exception in the Latin group is France and in particular Paris and other major French cities. But I think Spain, Portugal, Italy make up for France.

All the other groups seem more individualistic. Germanic's have the least group solidarity, least family values and are the most individualistic. I think this is obvious after taking into account the statistics of German cities, Swedish cities, London and other English cities; all are very politically correct, have lots of immigration, low birth rates, low marriage rates, favor multiculturalism, and score lowest on family values. Of the Germanics I think Sweden and English cities have the worst group solidarity, while Austria/Switzerland have the highest.

[The Alchemist]

I voted for germanics. Latins not at all.

[Sikeliot]

I don't feel a sense of Latin solidarity myself, but I know some do.

[Foxy]

I don't feel a sense of Latin solidarity myself, but I know some do.

You live in the USA and obviously you aren't a real Latin. As for the French, the most latinized culturally speaking are southern French and as far as I can remember we call each others "cousins", especially with Provençales and partially with Languedoc. And Aquitaine is the sister nation of Spanish Pyrenaic zone...
If for French you mean northern French I myself feel less links with them, although culturally I feel more links with them than to any other non Latin people (just think to all the French loans that exist in the Italian lexicoon).
There is a competition among us, none is denying this, but we feel like members of the same family.
Indeed, as someone wrote before, we have a strong sense of family and the concept of fatherland is strongly linked to that of the family.