Why did British colonies unite to form Canada?

Federation emerged from multiple impulses: the British wanted Canada to defend itself; the Maritimes needed railroad connections, which were promised in 1867; British-Canadian nationalism sought to unite the lands into one country, dominated by the English language and British culture.

Hope this helps if not I’m sorry :P

Explanation:

why does vagina taste like fish water (asking for a friend)

i have to go with a for this one