Answer:
Boundary lines were determined by political claims rather than cultural characteristics of regions.
Explanation:
The European colonial powers divided the Black Continent along their colonies´areas and spheres of influence. Then and even now, drawn borders did not take into account cultural and ethnic factors; colonialists separated peoples and cultures without thinking about them and the consequences. Today´s African borders are above all a colonial heritage and the cause of many conflicts and disputes.
The amendment which guarantees a trial by jury if you're accused of a crime is the 6th amendment.
The 6th amendment guarantees that you must have a trial by a jury of your peers. If you need any other help with what the 6th amendment offers, I recommend this website in order to further research the amendments of the constitution: https://www.law.cornell.edu/constitution/sixth_amendment