Losing Indian lands resulted in a loss of cultural identity, as tribes relied on their homelands as the place of ancestral burial locations and sacred sites where religious ceremonies were performed. Without their lands, nations lost their identities, and their purpose.
The Chinese constructed the "Great Wall of China." Some difficulties they had to face was possible invasion whilst they were vulnerable and focused on building the wall, invading animals, foreign lands, malfunctions with the building materials, (great stone blocks,) and possible death, since they were building in sometimes treacherous conditions.
Give the police all the details one I think brother.
Hope it helps
The answer is Food Surplus