Which of the following compromises was made between proslavery and antislavery groups at the Constitutional Convention of 1787? A- The slave trade would end immediately, but the holding of slaves would continue indefinitely.
B- Twenty years after ratification of the Constitution, the slave trade would be prohibited.
C- The slave trade would continue indefinitely, but high tariffs would be placed on imported slaves.
D-Forty years after ratification of the Constitution, the slave trade would be prohibited.

B- Twenty years after ratification of the Constitution, the slave trade would be prohibited.

Explanation:

The Constitutional Convention held in 1787 was never initially with the aim of changing the constitution of US but was secretly agreed to by the 55 delegate sent by some of the States. In the convention, series of agreements were reached ranging from the legislature, the electoral process and voting strength of each states to the slaves.

Series of compromises where made in each of the issue raised. For the Slave trading,  the compromise was that, after 20 years (exactly on year 1808), slave trade will be prohibited across the country.

im pretty sure it has something to do with the end of ww1