Which of these excerpts from the constitution best describes federalism

The power not delegated to the United States by the constitution are reserved to the states

Explanation:

Federalism is a political system in which political organizations (states, provinces) or groups come together to form a broader organization such as a central state. In the federalist system, its member states maintain autonomy. States unite to form the central system, but have the autonomy to define issues of various natures, such as the creation of laws, the definition of public policies, the creation and collection of taxes.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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