Answer: Most likely the industrial revolution.
Explanation: The use of machines in production became more and more prevalent, eventually many factories were built in cities which caused pollution therefore making the air gross.
Indian civilizations from earliest to latest.
1. Gupta Empire (320 -335 AD) Chandragupta (founder)
2. 4. Ghaznavid Empire (977-1186) Sabuktigin (founder)
3. Ghurid Dynasty (1011–1035) Abu Ali ibn Muhammad (first Muslim king
4. Delhi Sultanate (1206–1526) Qutab-ud-din Aibak (founder of the Mameluk of Slave Dynasty)
i think it was stalin but im not sure
I don't believe they are. I don't believe they have been proven real either.
Freedom of speech :) (and religion and press) i needed more letters lol