Depends on your view, this is an opinion-based question, so there is no right or wrong answer.
Here is my opinion: I think that the U.S should have declared war to Mexico. First, I believe that Texas was a territory that belonged to the U.S, as Mexican General Antonio Lopez signed a treaty that gave the U.S the right to annex Texas. Furthermore, most people that lived in Texas wanted to be part of the United States. Like democracy given to those in the Kansas-Nebraska territory years later, to decide whether they should be a free state or a slave state, the people should decide what they want to do with their state.
Second, I hold the view that the war is rational because expansionism is done in peaceful ways, but Mexico refused to be peaceful and immediately resorted to war. President James Polk wanted to expand the U.S, but Mexico refused to give up Texas. Today, we have Texas as a result of this war.
Some of the phrases of the declaration have steadily exerted profound influence in the United States, especially the proclamation, “We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable rights, that among these are life, liberty
The peace conference took place at Portsmouth Naval Shipyard, Kitery, Maine, US.
To finally end the conflict, Japan and Russia made a treaty called "The Treaty of Portsmouth". This made 12 sessions that lasted for almost a month in August. Theodore Roosevelt became the mediator of this agreement between the two powerful countries.
Your answer would be D because if the industrialization era in the late 1800s early 1900s
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