Places to visit in the summer in the usa for Most of Wilberforce’s Tory colleagues, however, were opposed to any restrictions on the slave trade and when he presented his first bill to abolish the slave trade in 1791, at the House of Commons, it was easily defeated by 163 votes to 88. Abolition of slavery. In February 1806, Lord Grenville, a leading Whig politician, argued in Parliament that the trade was contrary to the principles of justice, humanity, and sound policy. The Abolition of the Slave Trade bill was passed in the House of Lords by 41 votes to 20. In the House of Commons it was carried by 114 to 15 and it become law on March 25, 1807. British captains who were caught sustaining the trade were fined 100 pounds for every slave found on board. However, this did not deter the British slaver. Places to visit in the summer in the usa 2016.