Why did the guillotine replace previous execution methods during the Revolution?

Because it was believed that it will provide more humane method of execution.

Explanation:

Until guillotine was introduced different methods were used. Most of them were unhuman, especially because due some of them those who were executed would suffer during the process itself. That is why guillotine was introduced as more effective and precise method.

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

syria

tens of thousands of people were killed in as it’s longtime leader attempted to stay in power.