Answer:
Step-by-step explanation:
Dialect definition: a particular form of a language which is peculiar to a specific region or social group.
How did they form in the U.S.?: Influenced by immigrants and British Colonizers.
What made British English different from American English?:
The American and British dictionaries are very different, because they were compiled by two very different authors with two very different perspectives on language.
Hope this helps. :)