Elite southerners maintained their power over the yeoman majority by

convincing yeomen of their shared interests.

Explanation:

Yeomen was the people who are considered to be 'middle class', they are not particularly poor but they do not have as much influence as the elite has.

By convincing the yeomen that they shared interests, the elite class can easily influence the middle class into doing something that benefit them by creating the narration that it is the best course of action for all class in society. Most of the yeomen did not even realized that they are only used as puppets by the elites.

answer; collective security;

the correct answer is the following is a list of inventions made in the medieval islamic world, especially during the "islamic golden age" (8th to 13th centuries),[1][2] as well as the late medieval period, especially in the emirate of granada and the ottoman empire.

science and technology in the islamic world adopted and preserved knowledge and technologies from contemporary and earlier civilizations, including persia, india, china, and greece-roman antiquity, while making a number of improvements and innovations.