Private papers of what scientist had to be decontaminated for two years in the 1990's

What effect did john hay’s open door policy letters have on the imperial powers of britain, france, germany, russia, and japan? a. it provoked the imperial powers to declare war on the united states. b. it caused the imperial powers to restrict trade in their trade with china. c. it warned the imperial powers that the united states would soon declare war on china. d. it signaled to those powers that the united states would take a larger role in world affairs than before.

As a result of the work of the house un-american activities committee, hundreds of people were

Why was russia drawn into a conflict with germany after ausria-hungary declared war on serbia ?