Why was ancient Shandong poor? Please help us solve it. Thank you.

The economic development of ancient Shandong was restricted by many factors, mainly in the following aspects: 1. Poor geographical conditions: Shandong is mainly mountainous and hilly, with flat rivers and underdeveloped water networks. Limited by natural conditions, the development of agricultural productivity in Shandong is relatively backward, which cannot meet the needs of people's production and life. 2. Inconvenient transportation: Shandong is located on the coast of the East China Sea, which was once an important area of maritime trade in history, but the transportation in the inland part is very inconvenient. There were no roads and railways in ancient times, and the transportation efficiency of carriages and ships was not high and the transportation cost was high, which hindered the economic and cultural exchanges and trade exchanges between Shandong and other regions. 3. Political reasons: Ancient Shandong area became the battlefield of various wars from time to time, which was not conducive to economic development. Moreover, Shandong was once a battleground for military strategists. In history, frequent regime changes and unstable political situation have adversely affected economic development. 4. Natural disasters: Shandong's harsh climatic conditions, especially abundant precipitation and frequent natural disasters (such as floods, droughts, locust plagues, etc. ) has also seriously restricted the economic development of Shandong. Based on the above factors, we can think that the economic poverty in ancient Shandong was mainly due to the constraints of geographical conditions and social factors, which led to low production level, poor traffic, unstable political situation and frequent natural disasters.