The event that preceded the revolutions of 1989 is that gorbachev made reforms in the soviet union.Mikhail gorbachev was the eight and the final leader in the soviet union. gorbachev's policies of glasnost and perestroika and his reorientation of soviet strategic aims contributed to the end of the cold war.
Railroads made transportation of materials, supplies, etc much faster and easier.
Canals (such as the panama canal) helped make water transportation easier and quicker.
Roads made everyday travel easier
Florida & the could now use the Mississippi!!