Ge 42:1 When Jacob saw that there was grain in Egypt, Jacob said to his sons, "Why do you look at one another?"

 2 And he said, "Indeed I have heard that there is grain in Egypt; go down to that place and buy for us there, that we may live and not die."

 3 So Joseph's ten brothers went down to buy grain in Egypt.

 4 But Jacob did not send Joseph's brother Benjamin with his brothers, for he said, "Lest some calamity befall him."

 5 And the sons of Israel went to buy grain among those who journeyed, for the famine was in the land of Canaan.

 6 Now Joseph was governor over the land; and it was he who sold to all the people of the land. And Joseph's brothers came and bowed down before him with their faces to the earth.

God in His providence created the circumstances to bring about the dreams of Joseph to reality.

Ge 37:6 So he said to them, "Please hear this dream which I have dreamed:
7 "There we were, binding sheaves in the field. Then behold, my sheaf arose and also stood upright; and indeed your sheaves stood all around and bowed down to my sheaf."

And here they are, bowing to Joseph! Moses is showing his original Israelite readers that their God has the power to bring about His plans for them. If they only obey God, He can make the nations bow down to Israel as a nation.

De 28:13 "And the LORD will make you the head and not the tail; you shall be above only, and not be beneath, if you heed the commandments of the LORD your God, which I command you today, and are careful to observe them.