It was deloped by which the peasants of Medieval Europe became dependent on their land and lords. I hope this helps!
The gap between the rich and the poor decreased
Germany had no say the the conference. It was a treaty conference that basically punished them (Germany) after WW1
Answer:
"The doctrine of sola fide asserts God's pardon for guilty sinners is granted to and received through faith alone, excluding all "works" (good deeds). ... According to Martin Luther, justification by faith alone is the article on which the Church stands or falls."
Source: Wikipedia
Hope this helps