Guess the Map IV: A Thousand Cries for "Hint Please!"

Iran has 1910-19 and 1990-1999.

It is the middle blue so 1920, not 1910. Here are the countries with two colors. I have no idea what this map is about.

Iran 20, 90
Syria 10, 40
Estonia 10, 80
Seychelles 20, 90

Edit: Oh, and can we have a rule in these threads that whoever has the first post on a new page has to repost the map there? This would be very convenient and is quickly done.
 
Different people have different numbers of posts on their pages though. I have 40, while the default setting is 20.
 
The US dates for those were 1920, 1870 (well, de jure, at least), and other dates that are probably not in the 1910's.
 
Edit: Oh, and can we have a rule in these threads that whoever has the first post on a new page has to repost the map there? This would be very convenient and is quickly done.

Its funny that even though you brought up this problem you didn't bother to post the map.

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Is it some kind of government regulation?
 
Took me ages to figure out what Greenland got in the 70s (other than home rule) but I think I got it: When national chapters of boy scouts were founded.
 
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