Does summer holidays only apply to Europeans? I think most Americans are still largely in office for August

People take much more time off during the summer in the USA than during other times of year. It’s somewhat regional, but it’s been true in all the place I have lived. Probably July is the most common month though because in some regions schools start sometime in August. It’s not uncommon for people to take 1-2w off during that period. More than 2w often requires extra approvals, so is less common.