DECREE OF THE SUN, WILL HAPPEN?

my last post was not clear on the issue, see my doubts: I have friend, he follows the Adventist Church, and speaks of a decree on Sunday, ie the sanctification of Sunday, said the United States will be established first and then the world. He also warned that there are movements that leads to the Sunday decree. here is very common people talk about it, and I cunfuso, I am curious. Ellen White prophesied in the book. You (a) to p me the details of the prophecies. really going to happen? Is the end of the world? Am I clear? in which God protects.