Pennsylvania.
Georgia was the last colony to legalize slavery in 1798!
sometimes
1641
Massachusetts became the first colony to legalize slavery in what would later become the United States in 1641.
witchcraft
The colony of Pennsylvania did not legalize slavery. Its founder, William Penn, believed in treating all individuals fairly and equally, which led to the colony not endorsing the institution of slavery.
Massachusetts
The first emperor to legalize Christianity is Constantine
Massachusetts became the first colony to legalize slavery in the year 1641. Slavery is declared illegal in the Americas' Northwest Territory, or now known as the Midwest in 1787. And Abraham Lincoln issues the Emancipation Proclamation in 1863, or in other words, he stopped slavery trade among the Americans.
ask abe
I don't know if he was the first but I do know that Constantine was one of the ones who did legalize it and I think somewhat followed it.
Canada was the first country to legalize same-sex marriage.