It was the "Open Door Policy" that was the name of the trading policy that Secretary of State John Hay initiated with China and the European nations that already had a presence there, since the US wanted to benefit from trade with China as well.
In respect to the first question, it can be said that around 8000 BC to 7000 BC is the time period where evidence of cultural sharing in Neolithic China began.
<span>One big impact of the sharing on the individual societies was the positive impact on the ways of animal domestication and also agriculture.</span>
While he lost more battles than he won, George Washington employed a winning strategy that included signal victories at the Battle of Trenton in 1776 and Yorktown in 1781.