Who is responsible for putting all that junk up there?

The U.S. is responsible for 30% of it. Most of the rest of it comes from the former Soviet Union. Russia and the U.S. are the two major players. But the European Space Agency is starting to move, as well as China and Japan, and even India has spacecraft in orbit. It's getting to be a fairly international group of people.

US is FAIL and their dependence on space will
junk them.

Rome did not fall ih a day, but things happen faster now.