According to will and ariel durant in their book the lessons of history, in the last 3,420 or so years of recorded history, how many years have seen no war?

The correct answer to this open question is the following.

According to Will and Ariel Durant in their book "The Lessons of History," in the last 3,420 or so years of recorded history, only 268 years have seen no war.

"The Lessons of History," written in 1968 by Will and Ariel Durant is a history book that refers to the different periods in human history and the trends that have characterized those periods. Throughout the book, human history is analyzed from different perspectives such as race, geography, biology, economy, government, war, among others.

Regarding war, is sad to know that human beings are conflictive and warrior species of creation, waging war most of the time for power, dominance, and control purposes.

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.