The Three-Fifths Compromise was a compromise between Southern and Northern states reached during the Philadelphia Convention of 1787 in which three-fifths of the enumerated population of slaves would be counted for representation purposes regarding both the distribution of taxes and the apportionment of the members of the United States House of Representatives. It was proposed by delegates James Wilson and Roger Sherman. http://freestateproject.org/about/essay_archive/three-fifths.php
Slavery in Iran. At the beginning of 19th century both white and black slaves were traded in Iran. The 1828 war with Russia put an end to the import of white slaves from the Russian Empire borderlands as it undermined the trade in Circassians and Georgians, which both Iran and neighboring Turkey had been practising for quite some time. At the same time and under various pressures the British Empire decided to curb slave trade through the Indian Ocean.