Anything could happen. To be totally honest, most Americans, myself included, have never been outside of the country, so we don't know.
If I had to speculate based on the news, the fact that he isn't white, doesn't speak English well, and may have no electronics/ questionable electronics, all adds up to a high likelihood of him being detained for an indeterminate amount of time, and potentially being deported to somewhere that no one wants to be.
Stripes. Side by side. Peanut butter next to jelly next to peanut butter, and so on. No top. No bottom. Just utter chaos.