What is the purpose of expository text

Which historical detail can best clarify a reader’s understanding of the information in the excerpt? immigrant factory workers who spoke the same language were separated from each other at work. immigrant factory workers who spoke the same language were known to talk too much at work. immigrant factory workers had to pay rent for their chairs and the supplies they needed at work. immigrant factory workers were crowded into unsafe buildings with locked doors and fire escapes.

If one writes logically, he will prove his point. is this sentence correct or contains an unwarranted shift in person?

What was the primary message that dr. martin luther king jr wanted to communicate in the telegram he sent to chavez