Arguementative Essay Topic

I chose to argue why "The United States should go to war against the Confederate States in order to preserve the Union," from a northern perspective. I chose it because it seems like the one I know most about. I have learned that when writing about something, you should choose an argument or subject that you excel at. I think how I can explain that by using my background knowledge on The Civil War, and use many outside sources that are credible. I will use strong words that put my point across that "this is why we need to go to war." I will try to do my best like I did on my first essay.