It is the principle of Higher Law.
The Higher Law doctrine stated that slavery should be excluded from the territories as contrary to a divine moral law standing above even the Constitution. Senator Seward proposed this doctrine in 1851.
higher law
Higher Law
Senator William Seward's doctrine that slavery should be excluded from the territories because divine morality was above the Constitution came to be known as the Higher Law doctrine. He delivered his famous Higher Law speech on March 11, 1850.
William Benton - senator - died on 1973-03-18.
William Benton - senator - was born on 1900-04-01.
William Ruger - state senator - died in 1843.
William Kelly - senator - died on 1834-08-24.
Senator William T. Byrne House was created in 1916.
William Straw was a United States senator from Minnesota.
The web address of the Senator George William Norris House is: http://www.nebraskahistory.org
William Blount was an American politician who is one of the signatories of US constitution. He was a Senator from Tennessee and also served as Governor of Southwest Territories. A recent research showed that around 30 slaves were kept in Blount Mansion as workers by William Blount. This shows that he believed in Slavery and practiced it as well.