The map is bullshit tbh. It includes countries where the brits actually helped achieve independence (the Baltics after WWII).
The definition of invasion according to the book is apparently "has fought in conflicts in territory".
E.g Sweden is uninvaded according to this map. If Norway invades Sweden and the UK goes to help Sweden, it'll count as the brits having invaded Sweden for this map.
At first I thought that it was a bit of a stretch to include Brazil there, but I think that you can say that if you consider the English corsairs/pirates activity during the early period of Portuguese colonization.
Edit: also, probably that's the reason why the indland countries in South America are out of this list.
Rampjaar. 1672. We where the dutch republic back then so it included belgium, Luxembourg. We had a lot of wars before and after between us and the English in which the english took a lot of our colonies by fotce.
Belgium was "invaded" during WW1 and again during WW2.
Spain: ever heard of Gibraltar?
The English fucked with everyone who had a ship back then.
Weird to exclude Luxembourg from that as they were also occupied by Germany and freed by the Allied forces
Edit: checked the book and:
Netherlands, The: it counts the Battle of the Sluys and other various navel battles fought on Dutch territory as valid examples
Belgium: it counts the battles that were fought on the land that is now Belgium, so not counting from its creation. It also counts assisting the local people, so for example fighting off the French in defense together with the Flemish
So the book is taking "invasion" more lenient than the comment section:
The act of invading, especially the entrance of an armed force into a territory to conquer.
The introduction also states "invasion, had some control over, or fought conflicts in the territory"
So many times depending on who you trace modern Brits to. Romans invaded the Celts. Saxons invaded the Romans. Normans invaded the Saxons. And that's just England. Wales and Scotland could probably come up with another dozen plus examples between them
I don't think they ever invaded the entirety of the Arabian Peninsula, they had protectorates: Kuwait, Qatar, Bahrain, Oman, South Yemen, and the seven emirates that later formed UAE.