Here's why:
* Builds a foundation: The introduction sets the context and introduces the topic. Ending with the thesis statement clearly states the essay's main argument and guides the reader through the subsequent development.
* Provides clarity: Placing the thesis at the end of the introduction creates a sense of anticipation and culminates the introductory information.
* Serves as a roadmap: The thesis statement acts as a roadmap for the rest of the essay, outlining the main points that will be discussed in the body paragraphs.
While it's not a strict rule, placing your thesis statement at the end of your introduction is considered good practice for most English essays.