[neonsunset]

If you're pretty ignorant of the topic, then why do you know about the fact that "All Lives Matter" phrase only rose to prominence after "Black Lives Matter" movement in the US?

This is a pointed question led with dishonesty. It's important to ask oneself what was the motivation behind trying to manipulate other readers' perception instead of just dropping the "I'm pretty ignorant of this, but..." part in the first place.

[ant_li0n]

No, I really was asking a question. I don't know, was the phrase "All Lives Matter" in common circulation, before "Black Lives Matter" came around?

I really do not know, that's why I asked

[ryandrake]

"All Lives Matter" was not in common circulation until "Black Lives Matter" entered the scene, because the phrase is used as a rebuttal to "Black Lives Matter." That's why it's commonly understood to be a dogwhistle. When person A says "Black Lives Matter" and person B says "All Lives Matter", person B is really saying "NO. All Lives Matter" the un-spoken "NO" is their disagreement with "Black Lives Matter." If they agreed that "Black Lives Matter" they would not have had to come up with a rebuttal to counter it.