Byzantium/Constantinople was conquered in 1451, but the empire continued to decline starting around the 18th or 19th centuries. It officially died in WWI. As for how long it was a major threat to Europe, the empire's prime was the 16th century, under Suleiman the Magnificent.
What the Treaty of Ghent did achieve to which it ended the War of 1812 was it set up a peaceful process for settling future disputes. The war was between United States and United Kingdom and the treaty was signed on December 24, 1814.
The answer is letter A.
The striking feature of the Jacksonian era was an increase in the influence of the common man.
The last one the route increased contact with foreign countries
I think d is false because the kkk started in Tennessee