Organized in 1884, the first African American professional baseball team was the Cuban Giants.

Question

Is was the Cuban Giants a phrase?

Answer 1

No. Didn't I already answer this below? It's the complete predicate.

http://grammar.ccc.commnet.edu/grammar/objects.htm#predicate

Answer 2

No.

Study this explanation and list of prepositions.

http://www.chompchomp.com/terms/preposition.htm