This happened prior to 1974.
Before 1974, it was possible for Texas governors to have only two-year terms, whereas after that year, it was decided that governors could be elected to serve for unlimited four-year terms, which was an important change in the system.
The answer is "A" Vasco de Gama discovered a new route to india around the tip of Africa.
Thomas “Stonewall” Jackson
The introduction of silk into the Mediterranean caused the Abbasid Empire to be succesful in trade.
As the Silk Road passed through the center of the Abbasid territory, the merchants had to pay taxes to the Empire to be able to pass their products. This made that, due to the massification of silk in Europe, many more merchants used the route and, therefore, the Abbasid Empire was enriched. Thanks to this and the great cultural exchange through this route, there was a cultural renaissance and translations into Arabic of Greek, Persian and Syriac texts were made, and based on this knowledge, great scientific advances were made too. Industry and commerce also boomed.
