Here's why this placement is common:
* Sets the stage: The introductory paragraph introduces the topic and provides context, leading up to the main argument presented by the thesis statement.
* Clear direction: Placing the thesis statement at the end creates a clear sense of purpose and direction for the reader. It signals what the essay will argue or explore.
* Reader engagement: By building up to the thesis statement, the introduction engages the reader and piques their interest in what's to come.
While this is the most common placement, there are exceptions. In some cases, a thesis statement might appear earlier in the introduction or even be stated as a question. However, placing it at the end of the introductory paragraph is a strong and effective approach for most academic writing.