Answer: james k polk. which is a. 
good luck
explanation:
        
                    
             
        
        
        
Railroads helped connect the east and the west
        
             
        
        
        
Answer:
C he made an alliance with the other Mongol leaders 
 
        
                    
             
        
        
        
Answer:
By proving that they're capable workers.
Explanation:
In early 1900s, society mostly see women as incapable workers. So, the vast majority of the jobs were held by men only. During the world war 2, the vast majority of men were drafted as soldiers. This left a lot of jobs in the country left unfilled.
At that time, the women were the one that filled these jobs and became the backbone of United States' economy. They managed to silent all doubters from their high achievements.
Through this, women managed to opened up a lot of opportunities for employment.
After the world war 2 over, many companies started to hire more women knowing that they're just as capable. This highly contributed to the increase of  women employment in 20th century.
 
        
             
        
        
        
About 625k Americans died in the Civil War, this was the war that killed more Americans than any other! Most Americans died from disease being that doctors couldn’t really do anything to help them and, around 50k would die in prison camps the deadliest being Camp Sumpter located in Georgia.