Is transformers a cartoon with japanese or american background?

when on the wiki i read:
“The Transformers is an animated television series depicting a war between giant robots who could transform into vehicles, animals, and other objects. Written and recorded in America, the series was animated in Japan and South Korea. The entire series was based upon the line of transforming toys originally created by [...]

What’s that old Japanese cartoon with transforming robots that swapped heads to power up? It’s from late 80s?

I’m trying to figure out the name of this old Japanese cartoon that i used to watch. It featured transforming robots similar to the transformers series, except one of the major things was that there would be these small robots that would transform into these giant heads that would then attach to a separate giant [...]

Why the Japanese cartoonists are so obsessed with girls and boys around 16 years old?

I mean you constantly see them in situations that are more expectable for adults like racing cars, operating giantic robots, shooting guns and fighting demons.
To Roxy
You’re absolutely right those femenine looking cartoon guys are a turn off to me.

What do all of the Japanese characters on the Flaming Lips album “Yoshimi Battles The Pink Robots” mean?

It’s bugging me.

What’s the name of this 80s (early 90s) Japanese cartoon?

It was about this characters that had tiger-like robots which would fuse into a bigger robot a la Power Rangers. My friends think I’m crazy but I know there was a cartoon like this.

Which japanese artist is good at designing robots in your opinion?

I really have no great taste or eye for robots, mech, etc.
and I really want your opinion and help.