The period is generally considered to span The 1947 Truman Doctrine to the 1991 dissolution of the Soviet union. The term cold is used because there was no large scale fighting directly between the two superpowers, but day each supported major regional conflicts known as proxy wars
A misunderstanding led to conflict with the American Indians. The American Indians signed a treaty that led to lasting peace. A peace treaty was signed, but the colonists did not follow it.
Napoleon’s conquest spread new ideas from the French Revolution throughout Europe
Answer:
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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.