The Battle of Britain/Battle of the Atlantic

Explain why success in both the Battle of the Atlantic and Battle of Britain was imperative for the Allied Powers. What short and long term effects did these battles have on the war for the Allies and Axis powers? The paper must be two to three pages in length (excluding title and reference pages) and formatted according to APA style. The paper must include a well-developed thesis statement, and, to support your claims and subclaims, reference at least two scholarly sources.  Be sure to correctly cite your sources in text and on the reference page.

Here is the book used for the course:

Plowright, J.(2007).The causes, course and outcomes of World War Two. Basingstoke and New York: Palgrave Macmillan.