The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
<u>The correct answer is D. Gold was discovered in the Black Hills of South Dakota</u>. The federal government forgot the <em><u>Treaty of Laramie of 1868,</u></em> and on December 3, 1875, <em><u>ordered the Sioux to evacuate the territory and decreed a peremptory period (January 31, 1876</u></em>), after which those who refused to return to the reserves would be considered "hostile" with all the consequences that this term implied. The federal government decided to organize a military expedition to expel the now "hostiles" from the territory that had formally been recognized only eight years ago. In February 1876, preparations began. A long and extensive campaign was foreseen, given the difficulties of the climate and the immensity of the territory that had to be covered. In a first expedition, <em><u>the general George Crook left the first of March of 1876 towards the valleys of the Yellowstone and the Powder River, with the specific mission to destroy the village of the chief Sioux Caballo Loco</u></em>, after the Sioux Tribe declared war on the intruders and on the United States, as a consequence of the permanent invasions of <u>the sacred territory of the Black Hills because of the discovery of the existence of gold in 1871.</u>
Harriet Beecher Stowe
Stowe Sojourner Truth
I don’t know and it’s just question but if you could clarify the question I’d be glad to help you. With this question
Hello Historical narrative would be long and wordy, while the timeline would be short and to the point.