Why was sudan onder brithir rule

Exercising the leverage which their military superiority provided, the British forced Abbas to accept British control in Sudan

I think your question says Why was Sudan under British rule?

Explanation:

The British sought to gain control over Sudan to establish both a settler and plantation-based colony that would allow for them to gain more accessibility to the Nile, its trade routes, and the trading markets. This access to the Nile and its trade markets allowed for the British to gain significant amounts of profit from the sale and trading of British manufactured goods including textiles, alcohol, and guns along with establishing new trading relationships with the growing cities. Besides, the British heavily desired to gain access to the existent natural resources in Sudan with a specific interest in the cotton supply. Cotton would prove to be beneficial in further providing cotton to the manufacturing companies in the capitalist textile industry. This introduction of cotton allowed for the textile industry to produce an excess of textiles that in turn allowed for the industry and Great Britain to gain more wealth and profits from the constant supply and demand for textiles. As a result of the growth of nationalist competition throughout Europe, the British sought to establish a sense of nationalist power and international dominance by gaining yet another resource-rich African territory like Sudan. This addition of Sudan gave Great Britain further an authoritative advantage over its European competitors to achieve global dominance.

monarchy doesn’t have to have the hereditary element. there have been elective monarchies in the past where you choose your king-for-life and when he dies elect someone else for the job.