Which treaty was negotiated in 1926 to suppress the slave trade and slavery?

• A. Supplementary Convention (1957)
• B. Convention to Suppress the Slave Trade and Slavery (1926)
• C. Emancipation Act 1833
• D. UDHR

Answer: (B)

The main idea here is recognizing the particular international instrument created to end slavery and the slave trade. The treaty negotiated in 1926 is the Convention to Suppress the Slave Trade and Slavery, adopted by the League of Nations. It was the first binding international agreement that defined slavery and the slave trade and required states to abolish slavery, criminalize the slave trade, and take measures to prevent and suppress these practices within their territories. It established a formal framework for cooperation and enforcement across borders, setting the stage for later work in this area. The other options don’t fit because the Emancipation Act 1833 is an 19th-century British law, the UDHR is a 1948 universal declaration rather than a 1926 treaty, and the Supplementary Convention (1957) is a later instrument that builds on the 1926 treaty rather than being the 1926 agreement itself.