A: He has backed down from his intention to go to America.
B: Because of what?
A: Money, of course. It's the matter. He wants to realize his American dream.
B: And this also need money to begin, right?
E.g. The speaker's forceful words persuaded his opponents to back down.
E.g. Since most of the people present agreed with her, I had to back down.
E.g. I have been sure they are going to back down, but there isn't a sign of that.
E.g. He proved that he was right and his critics had to back down.
It is the matter.
Because of what?