Answer:
The essay must begin with an introductory paragraph that explains to the reader what the paper is about (topic) and clearly expresses your main claim (thesis statement). The main claim should be stated in the introduction so that the reader can assess its validity while reading the body of the essay.
In this case: a thesis statement should always be used in the first paragraph to state your opinion and reasoning.
The victory at the battle of Antietam gave Abraham Lincoln a platform to issue the Proclamation from a position of strength. This changed the character of the Civil War and prevented the European powers from intervening on behave of their trading partners of the Southern Confederacy.
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Example: (1) He is likewise a first rate performer on that classical instrument the Jew's rap.
(2) He would look the same had they played on the Jews harps and tin horns.
Here is two examples :)