It was the Western Allies’ commitment to open a second front against Nazi Germany, including an invasion on France.
Answer:
A secondary source is any source about an event, period, or issue in history that was produced after that event, period or issue has passed.
Explanation:
Aside from a textbook, the most commonly assigned secondary source is a scholarly monograph - a volume on a specific subject in the past, written by an expert.Secondary sources describe, summarize, or discuss information or details originally presented in another source; meaning the author, in most cases, did not participate in the event. ... Examples of a secondary source are: Publications such as textbooks, magazine articles, book reviews, commentaries, encyclopedias, almanacs.
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The Middle Colonies had much fertile soil, which allowed the area to become a major exporter of wheat and other grains. The lumber and shipbuilding industries were also successful in the Middle Colonies because of the abundant forests, and Pennsylvania was moderately successful in the textile and iron industries.