The correct answer to this open question is the following.
You forgot to include the options for this question. However, we can answer the following.
The following issues played the largest role in motivating the events Charles Sumner criticizes in the wrongful declaration of war against México: "The increasing U.S. desire to annex Mexican territories in New
Mexico and California."
Charles Sumner (1811-1874) was a United States Senator from Massachusetts, who opposed slavery in the country. He also was considered to be one of the toughest radical Republicans in Congress who exerted pressure during the American Civil War.
Regarding the imperialistic desires of the United States, he supported the annexation of Alaska, but had his reserves regarding the Mexican territory and opposed the annexation of the Dominican Republic in the Caribbean.