How Developed are the Gun Laws in America?

It has almost been a year since the Sandy Hook Elementary School shooting and still little has been done to chance gun laws. I find this extremely disappointing because this seems to me, like another mass shooting waiting to happen. 

In my American Studies class we have been comparing the American government's spending to other governments around the world. Similarly, I compared american gun laws and regulations to other countries. 

America has overwhelmingly higher rates of gun related deaths than any other developed country. I think the question we should be asking ourselves is why America has so many more gun related deaths than all these other counties? Why is it that Japan had less than 20 gun homicides whereas the US had over 1200?

Canada had less than 200. Spain had less than 100. Australia had less than 50. All countries that are very much developed like the US and the US is experiencing 10x as much gun violence as them. 

Many people say that it is because of our pop culture in the US and that violent video games fuel aggression and cause people to become mentally troubled then leading them to kill people. I don't believe this because Japan is much like American where violent video games are extremely popular but they have one of the lowest, if not the lowest gun homicide rates in the world. 

I believe that the issue lies in the second amendment because it doesn't let the nation successfully control gun violence. The main purpose of the American government is to keep its citizens safe and how can anyone be safe when the US is one of the most dangerous developed countries in terms of gun safety. The second amendment was made at the beginning of this country and could it be that this amendment has become dated? Could it be that this amendment is taking a negative effect on our country? Does America have the capability to solve this issue?