Are people judged all at once, or is each nation judged after those who preceded it?

We previously clarified that the reckoning of the Ummah of Muhammad (peace and blessings be upon him) is the first.

What confused the questioner is not evidence of a disparity in reckoning; rather, it is information from the Prophet (peace and blessings be upon him) about some unseen matters that Allah revealed to him. It does not necessitate that those he saw had already been reckoned. Moreover, some of what he reported might pertain to the stage of Barzakh, meaning it is punishment and reward preceding the reckoning that will occur on the Day of Resurrection. Therefore, there is no basis for using what was mentioned as evidence for a disparity in reckoning.