I would say the answer is C. Persons from varied backgrounds working together to try to do a job well.
The completion of the Transcontinental Railroad greatly affected companies that made products in that it made it far easier for them to transport their goods over long distances to markets, which greatly increased profits and output.
Eliza's grandpa has these memories stored in his individual memory.
The Han, Roman and Gupta empires all fell do to invasion. A strong, loyal army is necessary to protect the empire from invasion. All of these empires were first weakened by a succession weak governments. The trust and faith in the government was eroded over time. Internal strife by the people because of declining abilities of the government to govern weaken the state. The government should try to prevent internal rebellions by maintaining good governance over the people.
Such as in the case of Tsarist Russia in the earliest 20th century, absolute power can lead to much cynicism towards the autocratic leader, in which he/she is seen as the centre of blame for all social, political, and economic circumstances. this can lead to uprisings, strikes and revolutions where the masses rise up against their sole leader
