States are not empowered to declare war. Only the president has this power and it must be approved by Congress.
Texas qualifies as such.
In the State of Texas.
Should it become necessary any sovereign state can declare war on any other.
because they wanted to
There was no official way that a state could secede, so the question was tested by the Civil War. That war determined that a state could not secede. There is a possible exception to this, as many people believe the Constitution of the State of Vermont retains the right for that state to secede.
4 years.
They went to war to gain glory and control more teritory.
Wisconsin on 29 May 1848.
No, Spain had no relevance to Texas after 1821.
Over land and water rights.
you may go to college at 17 in any state
in my state yes but that may vary