So the question ask what is the result in the westward expansion in the mid 1800's and the best answer among your choices is letter A. increased dramatically. I hope you are satisfied with my answer and feel free to ask for more if you have clarifications
Answer: Abolitionists
Explanation: This law required that fugitive slaves seeking freedom be captured and sent back to their masters as part of a compromise in Congress (this angered Abolitionists, who believed escaped slaves deserved freedom).
A treaty was made and they got peace
Spanish colonists began to rely more heavily on the Atlantic slave trade by the mid-1500s because they started massive construction products for which they needed a lot of free labor force, they also started trading with slaves and wanted to gain a lot of profit from it.