What was the significance of the soviet union's launching of sputnik?

Aresult of japan’s attack on pearl harbor was? a the us formed a pact with indochina against japan. b the us formed a pact with germany against japan. c thousands of americans died, and the us declared war. d thousands of japanese people died, and japan declared war.

The persian empire finally fell to the armies of

What do historians call the political,social,or cultural circumstances surrounding an event?