Why did Alexander Graham Bell emigrate to Canada?

Bell's parents decided to move to Canada in 1870, when Bell was 23, after both of Alexander's brothers had died of tuberculosis, aged 19 and 25. Bell himself had been in poor health for many months. Bell's father had previously convalesced in Newfoundland, so the family moved from London to Brantford, Ontario.

Bell himself took teaching positions in Boston and lived in Cambridge, Massachusetts after his marriage in 1877. In 1882, he became a naturalized US citizen. Bell later moved to Nova Scotia, and lived to the age of 75.