The 16th Amendment allows congress to impose taxes based on income
It brought them harm because they expected Hitler to be satisfied and they believed that if they gave him what he wanted that he wouldn't cause a new war and wouldn't bother them. This is why they didn't prepare for what he did when he started the war and why France was defeated so fast and couldn't do anything about it and why England became locked out of Europe completely until the arrival of the Allies.
Im pretty sure its labor relations
hope this helps.
It true it was the spark and beginning of ww1
William Blackstone- Wrote the commentaries on the Laws of England
John Locke- Maintained that the government cannot black a citizen's rights to life, liberty, and property, Believed that natural law was given to humans by God, wrote the Second Treatise on Government, Supported the concept of popular sovereignty.
Hope this helps :)