Answer:
D. He had been against American involvement before becoming president.
Explanation: just saying it might be wrong
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! :)
My guess would be the first one , 1830 , Hope it’s the correct answer ! :)
Refers to the English term "Myth" or "Mythology"