Yes, the 10th Amendment is the most precious amendment of all.
A state should be able to implement their citizens wishes, so long as it does not interfere with the US Constitution.
If the US Constitution does not explicitly grant a federal power, then a state is free to set its own laws.
So could Colorado, California, Texas, Florida, Nevada, Montana or Arizona change their state's language to Espanol, if the majority of their citizens vote to do so??