Well, there were no plantations in the northern colonies/states but they had slaves too!Do you know what the term "sold down the river" means?<quoted text>
You wrote : " Canada, where it was a colony or a country, allowed slavery!!!" Wrong. Canada became a country in 1867. Slavery was long gone by then. Canada as a country never allowed slavery. But you did. And, what's more, we've shown, you've shown, that slavery was minimalist at worse in French and British colonial what was to become Canada. No plantations, as climate did not lend itself to them. And the slavery you talk about was on such as small scale that does not even come close on a per capita basis to what you had in the US, particularly the south, and in Brazil, and the Caribbean islands.
I northern states black slaves were not usually used in farming but to work in mills, black smith shops, etc. and they were not usually batten. But if they did not work or were to much of a trouble they were sold "down the river" to a plantation in the South which usually meant harsher working conditions.
Oh, being "sent UP the river" referred to prisoners from New York City being sent UP the river to the prison at Sing Sing!
Now, do you know what "POSH" means?