I know this sounds like a semantic distinction but it's...
CMV: There is no legal way to bring real change in the USA.
Legal for who? Because there are absolutely legal ways for people in government to bring real change in the USA. Just because they don't make certain needed changes doesn't mean they aren't possible. I know this sounds like a semantic distinction but it's not. You have to keep in mind that there is no universal law saying, for instance, that politicians have to listen to lobbyists. They choose to do so, and they can choose not to. Just because it isn't simple, because it might harm their future prospects, because in reality it would take a while to untangle the repercussions, doesn't mean they can't choose not to. Saying otherwise is defeatism and downplays their responsibility. Following from that, one legal way to bring real change in the USA for someone currently not in government is to run for office. Which by no means is easy or guaranteed or something everyone wants, and when they're in office they can always, again, just not make the change, but it's been very effective for the Tea Partiers/Trump supporters and the changes they wanted.