I'm assuming your question is in reference to matters before World War I.
I'll answer based on choices I've seen elsewhere:
changing relations between powerful nations
one nation’s invasion of another nation
resentment from past conflicts
Explanation:
The changing relations between nations were especially seen in the system of alliances that developed. The alliances and military plans which were put in place before World War I presupposed a major war between the countries which were tied together with alliances. The Triple Entente lined up Britain, France and Russia as allies. Germany, Austria-Hungary, and Italy aligned with one another as the Triple Alliance. Germany thought if a war began it would need to fight on two fronts -- west and east. So German Field Marshall Alfred von Schlieffen drew up war plans that said attack France first, quickly, and then hold that territory while deploying forces to contend with Russia in the east. When World War I began, that's the plan German forces put into effect.
When World War I began, it was triggered by Austria-Hungary threatening war against smaller independent nation Serbia, after the Austrian archduke and his wife had been assassinated in Serbia. The Russian army mobilized to protect Serbia (an ally of theirs). The Germans then declared war against Russia for the troop mobilization and looming invasion of Triple Alliance territory that they saw taking shape.
Germany and France had been at odds for a long time, and the establishment of the German Empire in 1871 had come after the Germans defeated France in the Franco-Prussian War. So yes, there were past resentments in place.
One way in which the development of the Bessemer process affected the growth of cities was that "<span>a. It enabled the mass production of steel, which was used to build new factories," since it sped up the removal of impurities from the iron product. </span>
Generally speaking, cuneiform was probably developed as a means of keeping records of "<span>c. trade and commerce," since this would have had the most pressing impact economically. </span>
El Senado de los Estados Unidos es la cámara alta del Congreso de los Estados Unidos, y junto con la Cámara de Representantes de los Estados Unidos, emana la legislación federal. El Senado está localizado en el ala norte del Capitolio de los Estados Unidos en Washington D. C.