The US is large enough, and populous enough, and spread across so many climates, that different regions disagree dramatically on how they want to be run and wha

The US is large enough, and populous enough, and spread across so many climates, that different regions disagree dramatically on how they want to be run and what is important. Sometimes a state wants to do something unconstitutional, but in general state's rights allows people to decide things for their community, without having to answer to strangers they'll never meet, 3,000 miles away. It is perhaps instructive to note that the US is the 4th largest country by landmass. Canada, 2nd largest, is also a federation. (The other two are Russia and China)