China is still in the civil war status, resulting in the divided state cross the Taiwan Strait. Politicians and people in the Mainland and Taiwan need great wisdom to avoid the war happening again.
'One nation, two systems' is proposed to reunify the Mainland and Taiwan by the Mainland side (People's Republic of China), but it is not accepted by the Taiwan side (Republic of China). Negotiation is required to resolve the problem.
Obviously, the commonality of the two sides is China in which people have the same language, culture, and history. Therefore, there is no reason to let the divided status continue after over 70 years division. China should be the nation name used for reunifying the Mainland and Taiwan. The problem is solved!