The correct answer to this open question is the following.
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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. 
 
        
             
        
        
        
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The union has more states. Since, the union has more states that means they have more advantage because they have more power than the confederate states.
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The first transcontinental railroad was a 1,912-mile (3,077 km) continuous railroad line constructed between 1863 and 1869 that connected the existing eastern U.S. rail network ... The report failed however to include detailed topographic maps of potential routes needed to estimate the feasibility, cost and select the best ...
About the other dots, don't worry about them alright?