Most european nations have a dominant culture no dominant culture several dominant cultures no culture at all

The best answer to the question above is a dominant culture. Most European nations have a dominant culture. The Greek and Roman laws and society structure are pretty compact. Even in England, Wales, and other English countries, the society's structure are really still and solid till to this day.

The correct order of events (with dates and notes following):

The Soviet Union’s spies gathered information about the US Manhattan projectThe United States created three bombs as a result of the Manhattan Project. The Soviet Union detonated its first atomic bomb.  The United States detonated the first thermonuclear or hydrogen bomb.

Details:

Soviet espionage concerning the Manhattan Project occurred all the way along the line during the project, from 1940-1945.The first bomb, called "Gadget," was detonated as a test model in July, 1945.  The "Little Boy" and "Fat Man" bombs were dropped on Hiroshima and Nagasaki in August, 1945.The Soviet Union tested its first atomic bomb in 1949.The US achieved development of a hydrogen bomb in 1952.