Answer:
This is a primary source, namely a written one, because it derives directly from the past and its content hasn't been alternated.
Explanation:
Historians are dividing sources into primary and secondary. Primary sources are derived directly from the past, meaning that they are created at the time when some event happened. This is an example of primary source, as it is an original letter that one ruler sent to another one.
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King spoke these words in Detroit, two months before he addressed a crowd of nearly 250,000 with his resounding "I Have a Dream" speech at the March on Washington for Freedom and Jobs on August 28, 1963.Several of King's staff members actually tried to discourage him from using the same "I have a dream" refrain again.
The choice that was not a factor is America gained European territory after the war and was able to export products to Europe and Africa without economic barriers. America in fact sent much aid to European nations under the Marshal Plan to help rebuild european countries.
