The main purpose of the following sentence would be to entertain.
Industrial revolution
french revolution
slavery abolished in america
first railroad
lincoln was assasinated
When creating a summary, you will want to begin the summary with the name of the piece, who wrote the piece, then follow it up with the thesis of the piece to be summarized. When providing a summary, it is important to be as objective as possible. What this means is that you will want to exclude any and all opinion from the summary as well as any analysis. You should only include a bland retelling of the facts and nothing but the facts, which, again, should be free of your opinion.
I think that it is after the salutation or before the closing of the letter. If it were a letter, it would look like this:
Dear Dr. Doctor,
(Dear is the Salutation). Body of letter. Body of letter. Body of letter. Body of letter. Body of letter. Body of letter. Body of letter. Body of letter. Body of letter. Body of letter.
Sincerely,
Brainly