Hello!
Mikhail Gorbachev was the last soviet leader. He had the control of the Soviet Union between 1985 and 1991 and started two great reforms:
The perestroika: economics measures to recover the Soviet Union. For example: reduced the investments in military and opened the market gradually.
The glasnost: the "freedom of speech" and government transparency to the people.
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Answer:
The French established a colony in parts of Canada and brought their language with them.
Ending slavery means it will stop for sure, mean while ending the slavery trade means you won't be making more trades but slavery still exist.
Hope this helps! :)