The answer to your question would be (C. Steam engine)
Yes they are. they just are.
By force. The Spartan soldiers would make annual raids/attacks on the Messenian Helots mainly to threaten them into submission, but also as military practice.
I believe the answer is D. all of the above
So that America will live up to the standards that it was founded on. he wanted to end all of the cruelty and the hypocrisy that degraded the values of America as a nation