The first time in recorded human history that slavery was eradicated by legislative power of government was:

Correct Answer is: In the USA in 1777 after the revolutionary War

Explanation:

The United States is a very important country in the History of the Abolition of Sclabitude, After the Revolutionary War between the British and their 13 Colonies the first attempts to end Slavery were made. In 1777 the newly founded Vermont established in a constitution that "It is absolutely necessary, for the welfare and safety of the inhabitants of this State, that it should be, henceforth, a free and independent State...", This is the first time in history that the slavery was eradicated by the legislative power.

This influenced other laws gradually prohibiting slavery, such as in 1794 and 1800 where it was stated that no Slavery trades could be made by the Americas, the abolitionist movement started to grow mostly in northern states and by 1804 all of the northern states were free of slavery. Even after this other forms of slavery remained in the country, like the Indentured servitude, and was not until 1948 with the Universal Declaration of Human Rights that these other forms of slavery where eradicated.

they died because of a disease during the first spanish colonies.

the catholic church withhold people's access to the bible during the middle ages.

people could go to church and listen to the teachings, but it was absolutely forbidden to own and/or read the books of both the old and new testaments. it was also prohibited to translate the books (which where originally in biblical hebrew) to any other language.

this was done so the church could remain in control of what their teachings were and to enhance their importance and power, while also being able to judge people's actions through information that was unavailable for the general public.