It was in "Berlin" Germany that the European nations met to discuss how to completely dominate Africa, since this was during the "Scramble for Africa," when many different nations were trying to capitalize on obtaining abundant natural resources.
Astronomers helped because they could: help measure the time, or what day it is for the caravans.
Hopefully this has helped! :)
They were worried about living in another tyrannical monarchy like Britain, so they created a system (the articles of confederation) that was incredibly weak. This was quickly proven to be a poor system of government, so they created the constitution.