What does it mean to say the United States has a federal system of government?

A federal system of government is one that divides the powers of government between the national (federal) government and state and local governments. The Constitution of the United States established the federal system, also known as federalism. ... Only the federal government can declare war.

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answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

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