Which treaty was added in 1957 to strengthen abolition of slavery, the slave trade, and related institutions and practices?

• A. UDHR
• B. Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similar to Slavery
• C. Emancipation Act 1833
• D. Stockholm Declaration

Answer: (B)

The central idea here is how international law deepened the abolition of slavery through a follow‑up treaty that came into force in 1957. The Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similar to Slavery was designed to strengthen the 1926 Slavery Convention by expanding both the scope and the enforcement of obligations. It covers not only formal slavery and the slave trade but also related practices that resemble slavery—things like debt bondage, serfdom, forced or compulsory labor, and other coercive arrangements. It requires states to prevent, suppress, and punish slavery and to protect and assist victims, including measures to identify victims, provide redress, and recover assets tied to slavery.

This makes it the best answer because it directly corresponds to a treaty added in 1957 aimed specifically at strengthening abolition of slavery and associated practices. The Universal Declaration of Human Rights is a declaration from 1948, not a 1957 treaty focused on slavery. The Emancipation Act of 1833 is an older British law that ended slavery in the empire, not a 1957 instrument. The Stockholm Declaration dates from 1972 and concerns environmental issues, not slavery.