The presentation I see in the textbooks goes something like this, Maxwell realized changing electric fields produce changing magnetic field and vice versa. Therefore, at least intuitively, one can understand why there should be such a thing as Electromagnetic wave. Which then Maxwell showed, as far as I know, by using the set of equations named after him that there indeed must be electromagnetic waves. And then the text books, at least the ones I have consulted, go on to declare that light is an electromagnetic wave without feeling much of a need to explain why that might be.
The identification of light with electromagnetic wave, I feel, is among many bits of physics that is taken for granted in the text books. I believe it is the result of a hindsight confirmation bias, that is we have so many consistent evidence that light is electromagnetic wave, the books don't think it necessary to explain. And for students, as they are hearing the statement from the elementary school, they often don't ask why must that be but accept it without questioning. I did so. And some other students I spoke to did that as well (forgive me, my sample size is not large enough regarding this, but I strongly believe this is the case for many students as well). It is not at all obvious to me that the existence of electromagnetic wave would imply that light is also such a wave. Maybe I am missing something crucial, but in this background let me ask the question in the following.
How, historically speaking, light was identified as an electromagnetic wave? What was the Logic/experiment that led scientists to suspect that light is an electromagnetic wave? (The logic can also be a vision, like in the case of Faraday who realized electric charges produce electric fields.) After searching in the internet I found this quote by Maxwell from "A Dynamical Theory of the Electro-Magnetic Field,"
We have strong reason to conclude that light itself—including radiant heat and other radiation, if any—is an electromagnetic disturbance in the form of waves propagated through the electro-magnetic field according to electro-magnetic laws.
I basically want to know what is that strong reason that Maxwell is referring to and which has led him and other scientists to realize that light is a part of the electromagnetic spectrum. kindly weigh in.