Which of these would have the least impact on desertification?
civil wars
lack of rain
too many cattle
a need for more food
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civil wars is your answer.

Civil wars have almost no connection with desertification.

1. lack of rain: because there is no more water flowing inside, it leads to the plants dying. Without anchoring roots, the top soil is blown away, exposing inner soil, which, when baked by the sun, can turn into a desert

2. too many cattle: Like the above, when the plants are eaten through grazings of cattles and other livestocks, the soil would have the same effect as "lack of rain".

3.a need for more food: Because there would be less virgin land, and more land is needed, the land cannot be laid fallow, and so all nutrients would be used, leading to desertification.

hope this helps

in an absolute  monarchy, the  monarchrules as an autocrat, with absolutepower  over the state and government — for example, the right to rule by decree, promulgate laws, and impose punishments. the  monarch isnominally sovereign but the electorate, through their legislature, exercise political sovereignty.

well its is frequent rain

have a good day