Hitler made a law which isolated the Jews from the Germans and that the jews couldn't marry an Aryan.
There was also forced migration.
Answer: B- there were many different competing ethnic groups.
Explanation:
Answer: The French Revolution of 1830, also known as the July Revolution (révolution de Juillet), Second French Revolution or Trois Glorieuses in French ("Three Glorious [Days]"), led to the overthrow of King Charles X, the French Bourbon monarch, and the ascent of his cousin Louis Philippe, Duke of Orléans, who himself, after ...
Explanation: google