Most Protestant groups subscribe to the same basic tenets of belief. It's in areas like baptism and church governance that they mainly differ. Yet most Protestants could easily share communion and they freely mix.
Baptist preachers can preach in many Presbyterian churches and vice versa. Pentecostals can and do attend different denominational services of worship. You might be surprised at the fluidity of movement.
However, we need to keep out of the equation pseudo-Christian groups who are often considered Protestant. For example, the Jehovah's Witnesses. They refuse to be called either Catholic or Protestant and it is true - they are neither.
Mormons also preach a different Christ and a different gospel to the Bible one. Unitarianism is another group that cannot be embraced in the Protestant fold. We do have our limits!
But once the initial break from Catholicism was made, there was, in theory, no reason why other splits couldn't take place. It's the same in politics.
Hah. Protestants want to worship God instead of some old guy playing dress up. Also, being part of a Catholic Church is expensive.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.