Yes. Slavery was legal in the southern states when Polk was president.
Zachary Taylor was president in 1849. There is no 'moral value' of slavery
NO
Pro-slavery. He was President of the Confederate States of America.
When Lincoln was elected president in 1860, his views on slavery were already known and included:
Abraham Lincoln get credit for ending slavery.
aberaham Lincoln
Well abraham lincoln was the president known for abolishing slavery
Abraham Lincoln was the president and he also stopped the riot.
Slavery has been going on for as long as people can remember and three have been multiple presidents in office while slavery was being conducted but I am guessing you are referring to the slavery era with all the revolts, laws and such leading to the Civil War. During that time our 16th president, President Abraham Lincoln, was in office.
The first slave arrived in 1619 well before the revolution and the constitution, so there was no president when American slavery began.
The same as it is now that he became president .