Concerning what I was saying about Adam-ondi-Ahman, there is not a huge amount written about it, but Joseph Fielding Smith said,

“It was in the night vision that all this was shown to Daniel, and he saw the Son of Man come to the grand council, as he did to the first grand council in the valley of Adam-ondi-Ahman, and there he received the keys from Adam “and there was given to him dominion, and glory, and a kingdom, that all people, nations, and languages, should serve him: his dominion is an everlasting dominion, which shall not pass away, and his kingdom that which shall not be destroyed.” (Dan. 7: 13-14.) In this council Christ will take over the reigns of government, officially, on this earth, and “the kingdom and dominion, and the greatness of the kingdom under the whole heaven, shall be given to the people of the saints of the Most High, whose kingdom is an everlasting kingdom, and all dominions shall serve and obey him,” even Jesus Christ. Until this grand council is held, Satan shall hold rule in the nations of the earth; but at that time thrones are to be cast down and man’s rule shall come to an end — for it is decreed that the Lord shall make an end of all nations. (D.C. 87:6.) Preparation for this work is now going on. Kingdoms are already tottering, some have fallen; but eventually they shall all go the way of the earth, and he shall come whose right it is to rule. Then shall he give the government to the saints of the Most High.
This council in the valley of Adam-ondi-Ahman is to be of the greatest importance to this world. At that time there will be a transfer of authority from the usurper and impostor, Lucifer, to the rightful King, Jesus Christ. Judgment will be set and all who have held keys will make their reports and deliver their stewardships, as they shall be required. Adam will direct this judgment, and then he will make his report, as the one holding the keys for this earth, to his Superior Officer, Jesus Christ. Our Lord will then assume the reins of government; directions will be given to the Priesthood; and He, whose right it is to rule, will be installed officially by the voice of the Priesthood there assembled. This grand council of Priesthood will be composed, not only of those who are faithful who now dwell on this earth, but also of the prophets and apostles of old, who have had directing authority. Others may also be there, but if so they will be there by appointment, for this is to be an official council called to attend to the most momentous matters ‘ concerning the destiny of this earth.” (The Way to Perfection, p.289-291)

It is very easy for us to overstate how much we know, but this my understanding.

Adam: “Our birth rates keep dropping, as they are doing around [most of the countries] the world.” Many African and Arabic countries have not had a decrease in birth rate, and have in fact, had exponential population increases due to even minor improvements in child mortality. Examples: Nigeria and Pakistan.

That’s like saying the Soviet Union ceased to be. No, it didn’t. The land, the people, and the things (buildings, bombs, missiles, guns, bullets, nukes, etc.), ie, the “assets” did not disappear into thin air. The political associations of the S.U. came apart, but the major “chunk”, Russia, not only kepts its assets, but also the organization of that particular republic reorganized into a new political entity fairly quickly.