The same way the Mongols conquering China did, the Macedonians assimilated much of their culture into that of Athenian , Philips son Alexander helped further Greek influence through his conquests, creating cities like Alexandria and turning much of the eastern Mediterranean into a bastion of the "western" world at the time. Not to mention Alexander was educated by Greek Philosipher Aristotle.
The correct answer is An era of nationalism and economic growth
After the war of 1812 Americans felt proud of their country and a strong sense of belonging. Also during the war, the British government cut America’s access to manufactured goods and this forced America to somehow gain strength and produce those products internally what made the country gain economic independence.