I need somone to come chat with me about a subject in the comments for 30 points

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.

How did inovations in manufacturing lead to improvments in transportation?

Name 3 significant impacts of the tet offensive on the outcome of the war, it's participants, or the public image of the war.