How would you describe the relationship between the United States and Mexico in the late 19th c. And the early 20th c.

Mexico–United States relations refers to the diplomatic and economic relations between Mexico and the United States. The two countries share a maritime and land border. Several treaties have been concluded between the two nations bilaterally, such as the Gadsden Purchase, and multilaterally, such as the North American Free Trade Agreement. Both are members of various international organizations, including the Organization of American States and the United Nations.

a is correct

hope this let me know if it is right

answer; /// slavery should be outlawed in the new country, was part of the initial draft of the declaration of independence, but not part of the final