The rise and fall of fads will affect the equilibrium price and quantity for example if water was in short supply then the price will more than likely go up. Hope this helps!
I think your question means how did the discovery of gold contribute to the creation of the transcontinental railroad. There had been some movements toward westward settlement in the 1840s, but that trend accelerated dramatically with the discovery of gold in California. James Marshall's finding of gold at Sutter's Mill in California in 1848 led to a "gold rush" in the decade that followed, with 1849 seeing a huge influx of people to California. (Thus we refer to the '49ers.) The swift settlement of California added incentive to build a transcontinental railway. The Pacific Railroad Act of 1862 established the charter for doing that. The First Transcontinental Railroad was completed in 1869.
C.)Radical Republicans wanted African Americans to have voting rights.
Movies were often used as political propaganda. For example, during world war 2, movies shown were either about the war or were actual scenes from the war using footage by people on the war fronts. This was done to improve morale and inspire people to join the effort. The movies would be about monstrosities by the enemies and about war heroes of the allies and the people would join the fight and want to help.
Caesar Augustus revivied Romes strength and wealth and created the position of emperor making Rome officially an empire. Julius Caesar's adopted son made emperors after the Republic more despotic. Rome however still experienced peace through what is called the pax Romana or roman peace. Its economic and military increased. For 200 years the empire remained great vigor amd began military expanison.