He decided to sell Louisiana because he no longer needed it. Napoleon wanted to take over some of the Carribean colonies and then use Louisiana to trade the good he would get from Lousiana. He was unable to do so because of the revolt in Haiti. He wasted many soldiers and still lost the battle so he gave up.
The chief executive role is clearly defined in the constitution, while the commander in the chief role is unwritten. The chief executive role involves foreign affairs, while the commander in chief roles involves domestic issues.
Build a strong military to prevent attacks from other countries
Plant and animal kingdoms.
These are in both the systems.