According to your link, the only children being removed were from Mexico. The Southwest Border is the Mexican border-if you refuse permission to enter, the child is still in his home country. Most of the immigrants are not
from Mexico, and so this does not occur.
What did occur is that the few children who did come unaccompanied, (about 12% of the total, as opposed to your claim that a big majority were unaccompanied), were held until sponsors for them in the US could be found. And under Obama, the kids were in custody for less than a third
of the time they were under Trump, due to the disastrous policies of the Trump Administration. So under Trump, the kids are being held ovr three times as long, it is harder to find sponsors, and so the mess under Trump continues.
And of course, you never get around to mentioning that, even though other posters have given you this information in this thread. Wonder why?