Why is the government prohibited from appealing a case if the defendant is found not guilty?

The correct Due to the doctrine of "Double Jeopardy"

Explanation: In Ball v. United States, the Supreme Court articulated a general doctrine wherein the State gets one swing at trying someone for a particular crime. If they can't prove it, they need to move on.

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "