what was the cause of balogun's red card

Balogun was sent off for serious foul play after a clumsy challenge on Tarik Muharemovic in the second half, with the referee overturning the original foul call after a video review. The challenge was described as making contact with the defender’s boot/calf area, and the straight red left the U.S. down to 10 men.

What happened

• Balogun had already scored earlier in the match.
• In the second half, he went into a challenge for possession.
• The referee initially gave a foul, then reviewed it and changed the decision to a red card for serious foul play.

Why it was controversial

• Some reports say the contact looked more like an awkward challenge than a clearly malicious one.
• The call drew attention because the video review changed the on-field decision.

TL;DR

He was red-carded for a challenge deemed serious foul play after VAR review, not for dissent or a second yellow.