shut your mouth
No other country will ever, nor should ever, adopt the US Constitution.
The US did adopt the English Common Law, the only state that does not have the English Common Law is Louisiana.
Not all countries are democratic. The world is filled with many different forms of government and some are good while others aren't.
Laissez-faire
it helps us navigate where to go.
If you are referring to ancient civilizations, it can be said that the Greeks had the most influence on the structure of the US government, because much of English law comes from them. If you mean a more modern civilization, it would be the British, since much of our justice system derives from English common law, including the things the states rebelled against.
Rome & Greece
shut your mouth
it allows us to be aware of whatever happened in the past. http://www.bestjobsmagazine.com/
Greek. Many buildings in the US government are of the ancient Greek style.
It is a California sixth grade history book "Ancient Civilization".
It is easier to adopt a child in the US.
country B - apex
The Greeks introduced democracy .
NO! This is because if ancient Korea did collapse then Korea wouldn't be with us here in our world. If it did collapse it would be like the Maya, Inca and Aztecs. Maya, Inca and Aztecs are not with us because the civilization has collapsed.
They gave us the idea of a tripartite government; with a legislative,judicial, and executive branch.