The cycle is described well in this short description of the rise and fall of the Qin Dynasty. The Qin began to conquer other states, then established their rule as a dynasty. Soon after they began to build the Great Wall of China. Then the Qin fell into a civil war that eventually caused the end of their dynasty.

Dynastic cycle.

Explanation:

Dynastic cycle in China is known to be a pattern to the rising and falling of several dynasties. This forms an important theory in the history of the country in which a dynasty can rise to a certain peak, both politically and culturally and then faces a decline due to corruption. The dynasty at this stage faces further loss of the mandate of heaven and then falls before a new dynasty can replace it, then the cycle repeats.

the underground railroad (apocope of the metropolitan railroad) is a system of urban trains located within a city and its metropolitan area. it is characterized for being a massive transport of passengers in the big cities, uniting diverse zones and their environs, with high capacity and frequency and in segregated form to other systems of transport. metropolitan railroads are built underground or on the surface, although most systems use mixed models where sections are combined in both modalities.

1 - as a result, the metro tends to reduce car travel for two reasons: first, due to the greater transfer of users from the car and, second, due to the reduction in the acquisition of cars in homes located in sectors near the stations of the metro.

2 -the metro allows to contribute effectively to the achievement of all the objectives of an urban development policy: it improves the efficiency of the city's economy by reducing travel costs and also generates a higher level of activities in the city center, taking advantage of of the agglomeration economies.

3 -it is a clean means of transport, since it uses renewable energy (usually electricity), taking care of the environment and avoiding excessive pollution.

if you could provide the poem below, i'd be happy to you!

explanation:

you didn't give us the poem, or the title of the poem. but it is essential for you to give us that, otherwise we can not detect when the poem has a tonal shift!