Quarterfinals clash against Spain
Striker Folarin Balogun, whose red card ban was lifted ahead of the game, played almost the entire match but had only one threatening effort on goal.
Belgium football chiefs had challenged Balogun’s eligibility for the game earlier on Monday but saw their appeal dismissed out of hand by FIFA.
The US’ elimination means all three co-hosts are out of the tournament, after Canada and Mexico also lost in the last 16.
Earlier, European champions Spain struggled to break down Portuguese defences but scored in stoppage time to secure their ticket to the quarterfinals.
Belgium will face Spain in the quarterfinals on July 10 for a place in the semifinals.
