no power to regulate commerce or trade between state.
The answer to this quesiton is <span>naturalistic observation
</span><span>naturalistic observation refers to a type of research in which scientists will observe the subject at their natural environment.
In this particular case, 'daters' are the subject of their experiment and 'dating events' are the natural environment.</span>
I believe the answer is: <span>Constitutional Amendment
</span><span>Constitutional Amendment was created in order to cross checked the constitution to determine whether any of it is violating the human/civil rights or not. The amendment that met need to be proposed by the majority of congress and ratified by the majority of states</span>
The Louisiana Purchase cost the U.S. about 15 million dollars
