Farewell Address by Washington--this address urged the nation to avoid alliances and getting involved in affairs not our own. This set the tone for isolationism.
Monroe Doctrine--this foreign policy stated the US would protect the Western Hemisphere from European involvement and implied the US would stay out of European affairs.
The Treaty of Versailles and League of Nations would involve the US in world affairs and bring European issues to the doorstep of the US.
Robots may be able to help doctors take care of people because of so many reasons.
your reasons can be,
Doctors will be less busy
They can keep people company
They can bring doctor tools
Northerners lost interest in the Reconstruction era because the Northerners got tired of trying to help fix the South's social problems and the Northerners wanted to start working on fixing their own social problems.
Hope this helps!