What type of government where the central government has all power

What were some characteristics of the yamato culture select all that apply a. it was a very weak empire with little knowledge of trade b. it believed its people were descended from kami the sun goddess c. it allowed woman to hold positions of power d. it developed technologies that improved life and increased trade e. its leader tokugawa brought peace to japan

Restricting immigrants from entering a country may be based on what belief?  

The social contact theory states that