The Great Depression caused the initial practicing, not to mention public opinion.
Due to the foreign affairs, and great losses during the time period, America had practiced it. They believed it would isolate them from conflict during the start of the wars. Later we found that was not true.
Probably the first state to leave the Union which was South Carolina all other states only threatened it SC actually fulfilled the threat
May sound weird i know but the answer is roaming pigs.
If you want to know what the <span>government can do</span>, specifically, <span>you can</span> look at ... Really, two things: first, don't think that the powers listed here are the <span>government's</span> only powers.
