There are many places of interest in China. When did tourism develop?

Tourism developed in 2 1 century. China has 9.6 million square kilometers of land, and our history has 5,000 years of civilization. On such a large land, such a long history has left us many places of interest. These are precious resources of our country, whether natural resources or historical and cultural resources, they are our precious wealth. We should protect them and make good use of them. 2 1 century ago, our country had just carried out reform and opening up, and people's living standards and quality were still relatively low. People don't have much spare money to travel and spend. At that time, the most basic food and clothing had just passed, and people who had just eaten enough had no sense of traveling. At the same time, there is little publicity in all aspects, and tourism is very depressed. After entering the 2 1 century, China's economy has been greatly promoted and developed after more than 20 years of reform and opening up. At this time, the pockets of ordinary people are bulging, which can meet the most basic living expenses, and people still have some spare money to travel. At this time, China's tourism industry has been open to development. After entering 2 1 century, after more than 20 years of development, China's tourism industry has gradually entered a period of rapid development. In recent years, with the economic transformation proposed by the country, the tertiary industry represented by tourism has become the object of various investments. It is a very good phenomenon that no matter which city in the country has scenic spots for people to visit. These great rivers, mountains and places of interest in China are very valuable, and they can be turned into wealth if used well. Therefore, the continuous optimization and construction of these scenic spots have continuously met people's growing yearning and demand for a better life.