I found a suggested edit in the review que of Mythology and Folklore SE, which has been there for a while. I see the user is also hanging around this SE @Vivikta. It's about this question and its answer
Could someone clarify if this edit is correct?
Comment: Krishna incarnated in the Dwapara Yuga and not Treta Yuga. RAma was there in the Treta
Original post:
Now, to answer your second question, what caused the people to eventually stop worshiping the lower deities (specifically Indra) - If we go by the mythology, this began changing in Treta Yuga when Vishnu incarnated as Krishna. Krishna actively dissuaded people from worshiping lower deities (and any other local gods, forest gods, tree gods, what have you) and exerted strong influence to move people towards monotheism. Gradually people stopped worshiping the lower gods/deities and when Indra got upset and tried to punish people, Krishna protected them from his wrath very publicly to prove his superiority.
Suggested Edit
Now, to answer your second question, what caused the people to eventually stop worshiping the lower deities (specifically Indra) - If we go by the mythology, this began changing in Dwapara Yuga when Vishnu incarnated as Krishna. Krishna actively dissuaded people from worshiping lower deities (and any other local gods, forest gods, tree gods, what have you) and exerted strong influence to move people towards monotheism. Gradually people stopped worshiping the lower gods/deities and when Indra got upset and tried to punish people, Krishna protected them from his wrath very publicly to prove his superiority.
I recognize this question might not fit and will remove it if required, but I myself am wondering what difference there is.