Evaluate the effectiveness of the U.S. government in dealing with the slavery issue from 1787-1857?This is including the Compromise of 1850 and the...

It's a very broad question with no single answer, of
course.  But the dates of your question give us some meaningful context, in that in
1787, the Constitutional Convention began, and in 1857, the Supreme Court ruled in
Dred Scott vs. Sandford that slaves were chattal
property.

So we can generalize that the policy of the US
government, as well as its intent, was to preserve the institution of slavery during
these years, or at least not to pursue abolition, and they were quite successful at
doing so.  The Constitutional Convention purposefully avoided the question of slavery,
for fear no unity between the states could be reached if a decision to abolish or keep
slavery permanently was pursued.  This is why the Constitution before the 13th amendment
says virtually nothing about slavery.  The other major motivation of the US government
in this time period was to keep the country from splitting apart over slavery and its
expansion, and they were somewhat effective in doing so by using political compromises
that allowed the expansion of slavery west, but with
limits.

The Supreme Court, throughout this entire period,
upheld the property rights of slaveholders and refused to recognize slaves as human
beings.

The Compromise of 1850 is where it started to
unravel, in that popular sovereignty in the Kansas Territory was a disaster, and led to
a bloody prelude to the Civil War.