Respuesta :
Because Canada was the main destination of the underground railroad, thus allowed many of the escaped enslaved people to move to canada in the 1850.
How did the escaped slaves fled to Canada?
Many of the slaves that fled to Canada did so with the help of the underground railroad which was a secret network of free blacks and white sympathizers who helped the runaways.
Hence, the underground railroad allowed many of the escaped enslaved people to move to canada in the 1850.
Therefore, the Option B is correct.
Read more about escaped slaves
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