Idea's From The Keyboard Of Lucy: Smaller Nation's

I wrote a post a while back about the nations of the world coming together as one big country to stop wars over territory and give everyone  the social and economic advantages but someone suggested the opposite and make the World a smaller place would be better.
There is a theory called 'The Breakdown of Nations' which states that the cause of social misery is that some nations are just too big and when a nation gets bigger than its neighbours it tries to dominate the rest so the way solve this, would be to chop up the continents into rectangular chunks of territory of equal sizes which would then be too small to cause harm.
Some would be easy to divide, the British Isles for example would fall into it's constituent nations of England, Scotland, Wales and Northern Ireland and the bigger European states divvied up which in some cases has already happened with Yugoslavia breaking up into Croatia, Kosovo, Bosnia, Serbia and Macedonia and Czechoslovakia splitting into the Czech Republic and Slovakia.
What was once the Soviet Union is now 15 separate nations but as Russia maintained its 'Big' nation status, it has since gone on to fight wars in several of them so maybe don't use that one as an example.
It is a return to the old days before nations began collecting Provinces into countries but as the last two Millennia has been almost constant wars in Europe and beyond from things ranging from which God is the most Holy to someone stealing a bucket (seriously) then as humans will literally go to war over anything, maybe we file that one under Plan B.