Unify
Part of speech: verb
Definition: Cause to become one; make into a unit; consolidate; merge; combine. Become one.
Example sentence: The world is a complicated place, and there's a lot of division between people. The performing arts tend to unify people in a way nothing else does.
Unite
Part of speech: verb
Definition: To come or bring together as one.
Example sentence: We could not be more proud to have LeBron James as part of our Lakers family. He is an incredibly thoughtful and intelligent leader and clearly appreciates the power sports has to unite communities and inspire the world to be a better place.