Yes, it would be very interesting. The problem is that counting the areas occupied by maritime empires prior to 1800 requires a rather vast research. The initial plan was to include also the Russian and Qing empires in the visualization. Anyway the whole thematic has a lot to go for (e.g. Mongolian, Roman). The Dutch empire would be a following natural choice if we wanna stick only to modern maritime empires.
Thank you!

The chosen data for Cuba's split was 1868 because it's the date of the declaration of independence prior to the Ten Years War. In all selection of dates the main rule was to distinguish the urge of a colony to become independent and not their recognition as a nation.
Cuba had other conflicts after this first declaration of independence (as well as other countries) but the constraints adopted didn't allow to visualize this.
I'll be working in another type of visualization of the same type of data, though.

Thanks!

I think the criteria you base your data on should be the date each country recognizes as its date of independence, and not the urge for being free. That urge may have come about decades in advance, yet it could have been the mindset of a minority. Besides both Cuba AND Spain recognize 1898 as the official year of independence. It's what they teach in school, it's what's written in history books and it's in the museums. Wikipedia is widely regarded as an untrustworthy source of information and I wouldn't consider it.

don't get me wrong; the visualization is still very good.

*nod* on this basis Australia should be 1901 and Canada 1867. I was extremely surprised not to see them until the 1930s-1940s... I have no idea what those dates are meant to represent, and neither rings a bell for me (an Australian who spent several years living in Canada).

Looking at Wikipedia I see you're using the Statute of Westminster (1931, adopted 1942 by Australia) but most Australians have never heard of that, and date the birth of the nation to Federation in 1901. I can't speak so authoritatively for Canada but I suspect they're in a similar situation.

Ditto for South Africa, the date should be 1910. I've no idea where the date in the 30s came from. 1968 is the other important date (republic) but by that measure Australia and Canada would still be part of the red blob.

Eso de que el ultimo español abandonó la isla en el 98 es relativo. Unos decidieron quedarse y abrazar su nueva ciudadanía y otros se fueron a Europa a seguir con la que tenian .

Since this video refers to military power, both Australia and Canada were granted their own control of foreign policy and defense (mostly) by the Statute of Westminster in 1931. That probably explains the difference between 1867/1901 and this video.

When both Canada and Australia were formed, their defence policy was still ruled from London.