I think c... after the Soviet union exploded their first atomic bomb in 1949 the American public was nervous since they knew what a bomb like that could bring.
Answer:
The great wall of china helped protect the land from outsiders. It also helped the army keep watch on intruders.
Explanation:
If you have ever seen the movie Mulan, at the very begining
the army is keeping watch on the wall and when the bad guy comes up the wall, the guards warn the other guards that there are intruders invading China.
Sorry if this doesn't help :(
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