<em>B. North America.</em>
Explanation:
Christopher Columbus actually never explored North America. The first person to explore North America goes to John Cabot, although there are numerous studies on how vikings were actually the first ones to explore North America. John Cabot, also known as Giovanni Caboto, went exploring when he got sent by Henry VII, and found North America in 1497.
 
        
                    
             
        
        
        
Answer:
The Union originally wanted to reunite the country, but after the Emancipation Proclamation of 1863, the Union goal changed to include the abolition of slavery. The Confederacy had the same goal throughout the war: to incorporate all slave states and secede from the Union, survive, and defend its territory.
Explanation:
 
        
                    
             
        
        
        
Answer:
This is what Bing says
"The Royal Proclamation of 1763 was issued by King George III on October 7, 1763. It followed the Treaty of Paris, which formally ended the Seven Years' War and transferred French territory in North America to Great Britain. The Proclamation forbade all settlements west of a line drawn along the Appalachian Mountains, which was delineated as an Indian Reserve. Exclusion from the vast region of Trans-Appalachia created discontent between Britain and colonial land speculators and potential settlers. The proclamation and access to western lands was one of the first significant areas of dispute between Britain and the colonies and would become a contributing factor leading to the American Revolution. The 1763 proclamation line is similar to the Eastern Continental Divide's path running northwards from Georgia to the Pennsylvania–New York border and north-eastwards past the drainage divide on the St. Lawrence Divide from there northwards through New England."
 
        
             
        
        
        
World war 1 put Russia in debt and the people of Russia didn't think that they should even be in this war. so they started a revolution which eventually put an end to the Russian monarchy.
        
             
        
        
        
<u>Answer: </u>
The role of the President pro tempore of the Senate is mostly ceremonial as he is appointed to work in the place of a vice president when he is not available and take everything in control. 
Mostly the power is in the hands of the other leaders and the senators but in the absence of the vice president the President pro tempore of the senate takes his place and certain duties are authorised which he can perform during that time.