Federalism and the 10th amendment work together--the 10th Amendment states that if something is not covered by the Constitution and there is no specific federal power, then the power goes to the state.
Federalism is the principle that government should be divided between a central power and regional powers. In the case of the 10th Amendment, if the central power doesn't have explicit power to do something then the states have the power to do so.
The five characteristics of civilization are:
1. Advanced cities: this is a large number of people living together and interacting with one another in term of trade and in other ways.
2. Specialized workers: people in the population are specialized in different specific fields that are important to the people at large.
3. Complex institution: there is organization in the community which is long lasting in nature.
4. Record keeping: Means of documenting important events and important information are in place.
5. Advanced technology: the people have invented means of solving emerging problems in the community.
The most important characteristic is the advanced cities. This is the foundation of civilization and without it no civilization can occur.
The "time bombs" being experienced
were the risk of chaos as there was no central power with the federal
government and states could have broken to their own. Because of the
decentralization of power it was very difficult to collect taxes
and keep the government going smoothly, the trade was difficult between various
states and all of these were real threats at that time.
The answer to this question is A states fears of an over powerful national government
