A map with a line around the South China Sea is what the current Chinese government has inherited from the previous Chinese government.
What is the value of that map? The current Chinese government and a lot of its supporters on this matter think that the map represents the rights for China to own the part of the South China Sea within the line, which is almost 90% of the South China Sea.
However, has any agreement between China and the countries around the line on the map ever been reached? If not, the map only represents an ambition, a desire, a plan, not a fact or reality. It only represents a goal that China tries to achieve, not a historical fact as the current Chinese government is claiming.
The reason why this goal is now being pursued openly despite of all the oppositions is that the current Chinese government is now more confident of its ability to achieve this goal and has more domestic support for this ambition because of increased nationalist sentiments, both of which is the result of increased national strength, including economic and military strength.
However, increased national strength can not alter historical facts and should not be used to try to alter historical facts. The current Chinese government may now have the money to buy ads all over the world to sway public opinions around the world. But historical facts will not change even if people’s perception of them change.
In Chinese, what the current Chinese government is doing is called 自欺欺人 – deceiving oneself while trying to deceive others (i.e., being delusional).