Railroads since they used it to ship goods
During the medieval period, a feudal contract<span> was a </span>contract<span> between a lord and his vassals. The </span>contract <span>consisted of an oath of fealty and defined the obligations of the vassal to the lord as well as the obligations of the lord to his vassals.</span>
<span>There were a number of factors that led to the rising tension
between Germany and France in the early 1900 including an arms race and tension
in eastern Europe. France had a large empire and felt threatened by Germany
which was rapidly industrializing and wanted to build up a navy and empire to
challenge other countries.</span>
World War II caused a massive reshifting in the world order in that prior to World War II, there were a number of world powers.
After World War II, only the United States and the Soviet Union remained as true world powers.