Why has some tropical grassland in Africa become desert, like the Sahel?

The Sahel contains the fertile delta of the Niger, one of Africas longest rivers. Unfortunately, the Sahels fertile land is rapidly becoming desert as a result of drought, deforestation, and intensive agriculture. This process is known as desertification.

Explanation:

bc of loss of water plus African Humid Periods Paced by Earth's Orbital Changes.

Explanation:

i hope this helps ;) - Mal

no sé si entiendes español pero te daría la respuesta si lo supiera, pero lo siento mucho

the climate of each region is different from one another.