Why do Chinese think of where Okinawa is Chinese territory?

As the CCP grows stronger it claims become bolder. They know none of the land they claim belongs to them, they fought for control of China in the late 1940's and know what they took from the ROC. Now they say at one time the people who lived in the China area were in some of these locations so they now belong to the CCP. This is a even worse claim to land than Hitler gave in the 1930's. If the CCP keeps claiming others land it is only a matter of time before the world will see another major war. Read the history of how wars in the past were started and you see the same thing. The CCP says one thing and does something completely different. For example: they claim all land the people in the China area ever set foot on. But they want to explore the moon and the US is the only nation to put men on this land and explore it. Does this sound like the CCP has the same rules for all nations or rules for the CCP and other rules for the rest of the world? The CCP has no rules, they only want what they want and care nothing what the rest of the world thinks. This line of thought will bring the rest of the world together on one side and the CCP on the other side. The nickle workers here talk of the destruction to these small nations, they do not understand the people of China can not feed themselves and have to import food. They also have no understanding of the real workings of the military or the understanding of technology and how stolen technology is always behind the developed technology. In any conflict the CCP will give the Chinese people up to the horrors of the war while the CCP stays hidden and safe in a safe bunker with all the comforts of the rich.