Nations are people all over the world on every continent and I'm not just talking about Africa, but places like India for instance where a ministry I am partnered with have found many hidden villages and taken the gospel to them. It's when all have heard that the end will come, Matthew 24:14.
Exactly, also when Jesus says (Matthew 16:27-28) there be some standing here this day who will not die until they see the Son of Man coming in his Kingdom, that could possibly be this since at this time he sat on the throne in Heaven, but I think he was speaking of the Visions that he gave to John (Revelation). So John saw Jesus coming in His Kingdom. Atheist really like that one....The truths are in there we just have to dig them out. Amen.
Vs. 27 in Matthew 16 is also cross referenced to Rev 19 when Christ returns in all His glory with His warring angels with Him. He will then cast the beast and false prophet into the lake of fire making an end to all the abominations that have cause desolation spoken of by Daniel or in other words makes an end to all sin. We, meaning all that are alive or have died in Christ who lay in the grave at that time will be part of the first resurrection to be with Christ forever on the new Earth and the New Jerusalem.
Vs. 28 says there be some standing here that will not taste death, not some of you as being the disciples, but some who will be alive at His coming for His Bride.