In a paragraph of three or four sentences, identify and explain the historical significance for British Columbia of SIX of the following twelve items.
1. Michael Harcourt
2. Pacific Great Eastern Railway
3. Hastings Mill
4. George Vancouver
5. Union Steamship Company
6. Amor de Cosmos
7. Frank Calder
8. Helena Gutteridge
9. One Big Union
10. Royal Engineers
11. Kwakiutl (Kwakwakawakw)
12. British Columbia Treaty Commission