The purpose of a persuasive letter is <u>" to convince readers to take action or support a cause".</u>
Persuasive letter can be defined as a kind of letter that is used to take a stance on an issue, convincing readers to agree with a certain opinion or idea.
Examples of persuasive letter is a letter used to convince a person to invest in a business, a letter used to convince an organization to accept an opinion etc.
Therefore, <em>persuasive letter</em> is used to convince the audience to accept an idea.
It's clear through the passage that there are no paved roads or cars to get the miners from place to place. They had to carry all of their gear and supplies through dangerous trails by foot, only being able to travel a certain amount each day.