Firstly Adolf Hitler was the leader of Nazi party who introduced the Agressive nationalism . He started the unquestioned power and agressiveness towards other citizens (jews) . 
Then  Hitler also brought in many reforms like  printing his own currency , land reforms etc to the citizens of the people .
He started monarchy and stayted that he was ultimate and used to print his currencies and magazines praizing himand this laid a huge impact on nazi's party
he was aggressive and was a dictator and people had to listen to him or else he would kill them
this aggressiveness of nazi"s party lead to world war 2