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

The correct answer to this open question is the following.

You forgot to include the question. Here we just have some sentences but no question at all.

However, trying to help, we can comment on the following.

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.

what are the choices btw if it was me id say the lack of money to continue with education

it allows shippers to carry commercial goods, which allows them to save time and money.