What punctuation mark belongs at the end of a business letter’s salutation?

Could someone write me a personal narrative it can be your idea

What is wrong with they follow citation of a book with two authors

What response does lincoln hope to elicit from his listeners with these words from his gettysburg address "we gave to come dedicate a portion of that field, as a final resting place for those who here gave their lives, that that nation might live. it is altogether fitting and proper that we should do this