"Why did Japan lose in WW2?" - Where can I find proper data?

Hello, as an aspiring historian I need to write a really good essay on the topic that I've written below. I need to have three main arguments and I've already came up with them. Now my question is where can I find a good reliable data about the number of military equipment of Japan's and US's armies and what kind of equipment did they use? Thanks in advance for any help :)