In section 57 the Lord tells the early saints that they are to settle in Missouri and build Zion there. Let's remember though that Zion isn't just a name of a city or a geographic spot on a map, it is also a title that God gives to His people, "And the Lord called His PEOPLE Zion." So when the saints get to Missouri and so much trial and struggles follow, perhaps, through difficulty, through hardship, the Lord really was building Zion. His people.