<span>Nationalism in the Balkans and a system of military alliances is the best selection for the major cause of World War One. </span>
<span>Among the choices given, the statement about slavery in ancient Rome that is correct is letter A, both nobles and common people owned slaves in Rome. Slavery in ancient Rome assumed a critical part in the public eye and the economy. Bookkeepers and doctors were frequently slaves. Greek slaves specifically may be very instructed. Untalented slaves, or those sentenced to subjection as a discipline, dealt with homesteads, in mines, and at factories.</span>
The concept of nullification is a "legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional with respect to the United States Constitution (as opposed to the state's own constitution)."
