4/10..I don't think I ever was able to link all the 4 groups, and yet have no idea why those groups were together, until now.

The countries link seems a little off, it's not incorrect as worded but one is definitely out of place, also there are a lot of other things which link those countries.

This makes my last one look easy I got the poems line that’s it

SPOILERS BELOW

I don't know quite what it takes to get marked as right on the connections. I opted for "WW1 combatant states", "poetic devices", "negatives highlighted in war poetry", and "supposed positive values of patriotic rhetoric", which got me zero.

Must really like the war poetry

The WW1 link might just as well be "countries". It's undeniably valid as there are no other countries in the grid.
And JamesD, did you really write all that stuff in the link boxes? Can't say you didn't try.

Right up my street