How was william wilberforce, a member of parliament, able to affect the future of slavery in britain?
in 1833, he achieved a ban on slave labor in factories.
in 1807, he achieved a ban on british slave trade.
in 1833, he was able to get reduced penalties for runaways.
in 1807, he was able to get slavery in britain banned.

The correct answer is "In 1807, he achieved a ban on British slave trade". William Wilberforce was a distinguish member of the Parliament of United Kingdom because of his fight against slavery for over twenty years. After, all that time he achieved the approval of the Slave Trade Act of 1807, which made possible a ban on British slave trade.

it required the unanimous approval of the states before the congress could enact any measure.