Woe = Ho! We now come to a cycle of woes corresponding with the "burdens". In these "woes" Jehovah's purpose is alternately thrown into sharp contrast (see the Structure, above). crown of pride = pride's crown, or proud crown (i.e. Samaria; compare Amo_6:1, Amo_6:3). Figure of speech Enallage (App-6). Referring to the circle of towers which girdled Samaria.
to = of.
Ephraim = one tribe. Put by Figure of speech Metonymy (of Adjunct), for all the tribes of Israel.