Ending slavery immediately would have had a devastating effect on the economy which had become dependent on cheap slave labor. It would have also motivated the South to secede. The slaves would have also been left without an immediate source of sustenance.
"Gold was not useful for making tools or weapons. A Diverse Capital. Koumbi, the capital city of Ghana,was the wealthiest city in West Africa because of the gold/salt trade. Many of the traders who went to Koumbi were Muslims. The local Soninke people kept their culture in tact by separating themselves from the Muslims."
The Volstead Act was passed to enforce the 18th amendment, which banned making, selling, and transporting alcoholic drinks.
The purposes of this act were:
Ban intoxicating alcoholic drinks
Regulate making, selling, and transporting of intoxicating alcoholic drinks
To supply alcohol for the use of scientific research and other practices allowed by the law
There are many different ways in which mass media spreads popular culture across the world, but now it is almost all done on the internet, where news stations have reach in practically every country.