A unitary system of government is a monarchy. Which means that the country is ruled by one person or a group of people. An example of a unitary system is a country that is run by a royal family, that consists of kings and queens.
A federal system is a system is a system of government that is run but not ruled by a government that has many different political parties and many different people. The United States is an example of a federal system.
Pros: World is more connected, people are better informed about current events
Cons: People spend more time online, thieves can steal personal info
Answer:
The nullification crisis was a conflict between the U.S. state of South Carolina and the federal government of the United States in 1832–33. Calhoun, who opposed the federal imposition of the tariffs of 1828 and 1832 and argued that the U.S. Constitution gave states the right to block the enforcement of a federal law.
Checks and balances, there really is no explanation for this it just blatantly is
The battle stopped the Germans from advancing further east.