Answer:
2) Refusing to join the League of Nations
Explanation:
The best action that demonstrated the United States' effort to isolate itself from European conflicts after World War I is "Refusing to join the League of Nations."
This is evident in the fact that the United States Congress failed to pass the bill to join the League of Nations. This is based on the idea or some Isolationists' fear that it might make the United States drawn into International issues unnecessarily.
oh this is easy it was the Napoleonic invasions through Germany Russia Italy and Austria. aka the Napoleonic wars in the early 1800's
They were the miners who had to go into the caves or underground tunnels and dig out what needed to be dug out.
