What new developments in retail sales occurred in the late nineteenth century

I believe the answer is: Chain stores, mail order catalogs

Chain stores were made so a company could have broader reach to more consumers which are spread in different geographic locations. Mail order catalogs is a form of purchase that can be done through telephone. This is made in otder to target the consumers who do not want to waste time going to stores.

we will reach the goal of freedom in birmingham and all over the nation,

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)