The major thing which the treaty of Guadalupe Hidalgo accomplish was that:
- D. It ended the war between the US and Mexico.
According to the given question, we are asked to state the major thing which the treaty of Guadalupe Hidalgo accomplished and why it is so significant.
As a result of this, we can see that the treaty of Guadalupe Hidalgo was an important document which was signed by the two warring nations of America and Mexico which brought about a ceasefire between them and end the war.
Therefore, the correct answer is option D
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