It was the British who fought against the Idians
I know for a fact that it was build to guard against the mongols, i'm not so sure about these two tho. It's the longest human made structure at more than four thousand miles, I want to say that two is also applicable
So the answers are 1,2,4
No they shouldn’t because it can interfere with the geography of the country if an illegal substance or organism is brought into the country
1854 they suffered backlash