Here are some points that could be used :
1. seceding would reduce the amount of resource that the nation as a whole had, so the federal government shall not allowed it to happen.
2. Many people in the population might not agree to the secession so the government had to protect their interest,
3. Secession make our nation become much more vulnerable to attacks, since foreign nations can leverage the separation to gain allied that close to us.
1 because college has effects that can last your whole life. All of the rest of the answers are short term.
Actually those do look correct which ones did you get wrong?
Thr forest
forest would probably the most, because it is already being affected a lot (deforestaion)
