When we come to Genesis 11:27, humanity has been divided into nations, all of which are in rebellion against God. However, in this passage God launches His plan to bless all those divided peoples through a blessed people, a people we must leave home to become a part of.

Resources:

Genesis 11:27-12:20

Word Biblical Commentary, Vol. 1: Genesis 1-15, Gordon Wenham

Genesis: Tyndale Old Testament CommentariesDerek Kidner