<u>The answer is "A group that has concerns about a narrowly defined subject". </u>
A single-issue interest group is a formal organization that has concerns about a narrowly defined subject and aimed to influence policy in order to create, maintain or change that particular subject. Some examples of what a single-interest group are interested in are animal rights, abortion, foreign policy, police brutality, gay rights, defending legal use of guns, etc.
In overall, they aim to achieve its purpose by lobbying government (including members of Congress, the executive branch, etc.), engaging in election activities, educating people about their interests, activities, relevance, current issues, etc., mobilizing people who act on behalf of the organization in order to perform activities, such as writing letters, making phone calls and demonstrating.
 
        
             
        
        
        
Answer:
It enabled families to remain in close contact even as they moved across the country and across the world.
Explanation:
Alexander Graham Bell is a well known scientist and engineer, who is widely known for the invention of Telephone. 
Telephone is practically used for making calls, whereby a user at one end, can get to listen and hear the other user, at the other end, regardless of the distance and location, in as much the telephone service network is available.
Hennce, it can be concluded that the long-term effects of Alexander Graham Bell’s invention, which is basically Telephone, is: "it enabled families to remain in close contact even as they moved across the country and across the world."
 
        
                    
             
        
        
        
In the spring of 1863, Edmonds and the 2nd Michigan were assigned to the Army of the Cumberland and sent to Kentucky. Edmonds contracted malaria and requested a furlough, which was denied. Not wanting to seek medical attention from the army for fear of discovery, Edmonds left her comrades in mid-April, never to return. “Franklin Thompson” was subsequently charged with desertion.
        
                    
             
        
        
        
<span>Prince Henry's goal was to reach your source of treasures in the East, to spread Christianity, overseas exploration. Vasco achieved his goal of finding new regions and treasures</span>