How do we know so much about the Mississippian Indians?

Maize-based agriculture. In most places, the development of Mississippian culture coincided with the adoption of comparatively large-scale, intensive maize agriculture, which supported larger populations and craft specialization. ... This is the belief system of the Mississippians as we know it.

Explanation:

That's how we know so much about it.

your answer is rising unemployment and inflation.

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.