There was a vast economic potential that had yet to be tapped by any other European power at this time in history, ironically enough when they did successfully reach China the Qin dynasty was already much more technologically advanced than the Europeans that had arrived and viewed their offer as invalid due to their perceived "backwardness" technologically.
Europeans especially wanted to get fine Chinese goods such as silk, tea and pottery. The United Kingdom and other countries used military power to force china trade.
prince Henry believed that if explorers found a way around Africa then that would be a short cut to Asia.
To get food
They wanted all of the good that they had.
Because they held religious beliefs that prohibited contact with foreigners
japan
Strangely enough, they didn't. They didn't know it existed. What they wanted was a shorter route to China, Japan and the Spice Islands.
silk
Traders where looking for a faster easier way
Sure,
Japan wanted to control China for land and natural resources. The Japanese thought they were the "superrace" and wanted other countries to fear them.
we wered to china and they were used to us and Japan had strict tarrifs and didnt want to trade with us
They want to stay independent to preserve their culture
The Asians wanted to stop trading with the Europeans basically because the Europeans had nothing they wanted or needed. The Opium war was what forced China to open up trades Britain.
The reason why China has become the coveted target of Japan is that China has a large territory and abundant resources, while Japan has a small land area and a very lack of resources. Another reason is that during Japan's transformation to industrialization, its economy developed rapidly, but China is still a closed country and a backward agricultural country. At that time, China was simply vulnerable. It was really sad that even Japan, a small bullet country, dared to invade. At that time, it was undoubtedly a once-in-a-thousand opportunity for Japan. Access to China's territory and wealth, so they also have the qualification to fight with Western powers, so they want to use China's territory to obtain the capital to squeeze into the list of world powers, so as to dominate the world.