They wanted to obtain votes from states that were pro-slavery and by abolishing it they may have ruined the chances of receiving southern states votes for a declaration of independence
Answer:
What was the significant cause of decline for the Songhai Empire?
In 1590, al-Mansur took advantage of the recent civil strife in the empire and sent an army under the command of Judar Pasha to conquer the Songhai and to gain control of the Trans-Saharan trade routes. After the disastrous defeat at the Battle of Tondibi (1591), the Songhai Empire collapsed.
Explanation:
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agreeing to continue the slave trade indefinitely
agreeing not to end the slave trade for at least 20 years
agreeing to end the slave trade immediately
agreeing to continue the slave trade for a maximum of 50 years