In my opinion, Kingdom is more about characters and what they do to accomplish their own ambitions (sometimes in line with their countries hopes, sometimes they can't care less lmao) while constantly being in war. The characters, 'good' or 'bad', are the main reason people like me keeps following the story, even when we have "spoilers" from the very begining due to actual historical facts hahahaha.
You are not exactly expected to root for the success of the main guys, or even for the inevitable unification, you are supposed to witness what the people behind these countries in conflict are going to do and how, which is why this manga also focuses a lot in strategy and warfare tactics. If you read Kingdom and you enjoy as it is, you may end up rooting for the characters you like as individuals with their own hopes and ambitions, not as part of their respective countries.
This manga is like Romance of Three Kingdoms (RoTK). There are dramas and something that are not entirely accurate to the history. It's for the author's discretion.
Just like in RoTK where Liu Bei is portrait as the main hero, wise and benevolent, but in history, Cao Cao was the main 'hero'. He was a brilliant statesman, general and leader.
I guess I should give it a try
Is it completed? Where can I read it?
But I googled on how long china was united for a first time and it's shows only 7 years max.
Since then I find it hard to root for these guys especially with all the wars and death.
If I am wrong please correct me so I can read this again....