Depending somewhat on the time-period in question, it was the "military" who often wielded a large amount of power and control, since they restricted many individual liberties. 
        
                    
             
        
        
        
Answer: all of these are correct
Explanation:
 
        
             
        
        
        
It caused the delegates to vote in 1861 that Louisiana would secede.
Answer: Option D.
<u>Explanation:</u>
On January 8, 1861 the governor of Louisiana, Thomas Overton Moore organised a convention which was about the secession of Louisiana. He ordered a militia arsenal to occupy the United States arsenal. 
He acted aggressively to engineer the secession of Louisiana from the union by a convention. Only five percent of the public was represented in the convention and the delegates voted 113 to 17 to secede from the union. And therefore there was secession of Louisiana.
 
        
             
        
        
        
The correct answer is B
The Mexican-American war was an armed conflict that confronted the US an Mexico between 1846 and 1848. The conflict emerged in the aftermath of the annexation of Texas performed by the US in 1845, a territory that Mexico still considered one of its provinces (the most Northern one). 
<u>The victory of the US over Mexico led to the territorial expansion that the first desired.</u>