<span>It is Pythagoras who introduced his famous theorem named pathagorian theorem</span>
Answer:
Letters and publications written by Nazi leaders before the Second World War.
Explanation:
This answer is correct because this historian is searching for the motives of these perpetrators, letters and publications can tell their thoughts and conversations.
I'm not sure but extract is a synonym of abstract
Where there any choices? This is true for a lot of countries: Basically all European countries with the exception of those that never fell to the Nazis :UK, Switzerland, Sweden, Spain, Portugal.