Confederation - Why did nova scotia agree to become united with Bna colonies ( Whyd it join canada)?

Why did nova scotia decide to join the bna colonies in becoming one group? The four factors are defence,transportantion, economic, and political. How was nova scotia in each of theese factors? Theese were the four factors they had to consider before joining. So wht made them join? Wht was good with nova scotia during the confederation and wht was bad ?