A system has one central government. A system has two levels of government. A system is union of states joined under a larger, central government

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A political system has different levels of government. In some democratic countries, it is called a Federation. This Federation is comprised of different states and provinces with the faculty of self-governing under a set of central laws or a constitution. As a political entity, the federation has branches that direct the order and legislation of states, provinces, municipalities, and local governments.

In the case of the United States, the federal government was created by the founding fathers as a division of powers under the system of checks and balances, in which each of the three branches of the federal government has no power over the other two.

most people now work in jobs where they do one  kind  of work; they are carpenters, bankers, cooks, mechanics, and so forth. likewise, most  businesses produce  only certainkinds  of  goods  or  services, such as cars, tacos, or gardening  services. this feature of  production  is known as specialization.