Why is there’s no American anime’s listed on this site?

In Japan, the term "anime" is used to refer to any kind of animation, regardless of origin (so, yeah, things like Ben 10 and Johnny Test are considered anime there), but MyAnimeList use the Western definition (i.e. any animation produced in Asia). However, I think that Western animations who DO have Japanese companies involved should be on this site.

Because that's what the word mean in English, a piece of animation from Japan. That's nothing new, there is also Donghua (Chinese animation), Aeni (Korean ones), and even outside animation, it's also done for Movies, like Bollywood (Hindi Movies) or Spaghetti Westerns (Italian Western). American Movies are almost always referenced by Hollywood outside of the US, even when the Movie is not actually made in Hollywood.

These terms were made to define a sub-specialization of the medias, targetted by country, and thus their culture that created it, that's all.

I think you are confusing the English word "Anime" with the Japanese one "アニメ". They are homophone; they are pronounced the same, but with different meaning. While, yes, Japan adopted the word from the English language, and English people adopted it back, they did a semantic narrowing in return, because no one calls animation "Anime/アニメ" (not even France, where the word "Animé" existed since way longer, and means animated).

Is it logical ? Not entirely, but most words created in recent times lack grammatical logic explaining their meaning. There is the same thing with "Sushi", by the way, where Japan thinks about the vinegared rice, while other in the world thinks about rolls with fish.

You can disagree, but it's a little bit late of over 40 years to redefine the word; it's already been populated in the whole world.

@Alexioos95 Anime is not an English word, and I'm not confusing anything. Anime is the romanized version of the Japanese word for it. English people and people who speak English are mostly not the same. Some english speakers think anime is jap animation, others think it's mature animation (these people don't consider kodomo anime as anime), some think anime is animation from China, Japan, and Korea, and many others who know the actual meaning that anime is whatever is animated. People simply didn't know what the word actually meant so they started using anime wrongly. It doesn't mean that it's actually meaning is changed 'cause it's dependent on the people who speak Japanese. And I haven't a clue about this sushi idea. If people think that's what sushi is outside Japan then they're not cooking and eating actual sushi.

Also, I'm not redefining the word. It's a Jap word, not an English one. English speakers even say kawai, konnichiwa and what not just for the feel so that's why they even started using the word anime.