It allowed the Federal government to limit free speech during times of war. An example is if the United States was currently in war and you outwardly said in public ”the war is meaningless, our government is not supporting freedom, the military is making our soldiers fight for oil companies don't join!”. The government may arrest you because you outwardly spoke out against it in times of war.
One of the major results of industrialization was that larger firms developed, due to the fact that major factories were used for production, which created more capital.
The main way in which patterns of spatial inequality change over time is that people who are poor tend to congregate in similar areas--areas that are oftentimes taken over by people with more means, which then drives the poor people out to find new areas in which to live.
Yes.
Although the constitution does not mention the issue of secession, The Supreme Court has consistently interpreted the Constitution to be an "indestructible" union. The states cannot leave the Union. There is no legal basis a state can point to for unilaterally seceding.