Why Did God Create the World?

For his own glory, oh yes!

And how does he glorify himself?

Jonathan Edwards:

The creation of the world seems to have been especially for this end, that the eternal Son of God might obtain a spouse, toward whom he might fully exercise the infinite benevolence of his nature, and to whom he might, as it were, open and pour forth all that immense fountain of condescension, love, and grace that was in his heart, and that in this way God might be glorified. 

--Jonathan Edwards, 'The Church's Marriage to Her Sons, and to Her God,' in The Works of Jonathan Edwards, Volume 25: Sermons and Discourses, 1743-1758 (ed. Wilson Kimnach; Yale University Press, 2006), 187

'All that immense fountain.'