Answer:
The Missouri Compromise
Step-by-step explanation:
This speech was made by Lincoln following the approval of the Kansas-Nebraska Act. Essentially, this act allowed any new states to judge for themselves whether they wanted to adopt slavery or not. This unfair law angered Lincoln, as it meant the end of the Missouri Compromise.
The Missouri Compromise stated that Congress had the ultimate right to prohibit the expansion of slavery into new territories that entered the US. Lincoln was thus understandably upset as he strongly opposed slavery.