The correct answer among the choices is lingua franca. In multilingual
societies and populations, a lingua franca is adopted as a medium of
communication between people with different vernacular languages. Countries
like India and the Philippines with a post-colonial past and a plethora of
local languages use English as their lingua franca, for example.
One of the main ways in which travel routes today differ from the trade routes of classical era civilizations is that they're far safer, since people have to worry much less about being robbed and/or injured--this is due mostly to government oversight and policing of the routes in question.<span />
The roaring twenties were called this because this was after the US won WWII so everyone was celebrating. The US started prohibition, but people kept on drinking and partying. It got so bad and crazy that this was one for the main reasons for the Great Depression
With the rise of a Nuclear Soviet State, the United States was auditing it's own internal defense capabilities.
One critical point was the size of the United States and the time it could take to move forces from one point to another in times of war and emergency.
Even within the United States, there was a rise in communist parties which were slowly becoming a threat.
The Interstate highway act not only produced economic benefits to stop the rise of communism in the United States, but also provided nation-wide infrastructure to smoothly and quickly move forces across the country.
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