Was at the center of is credited for coming up with the Heliocentric Theory. The Heliocentric Theory stated that the
the univers?

Your question is unclear, but the heliocentric theory is the theory that the sun is at the center of our solar system, which it correct. It became believed over the old theory, the geocentric theory, that Earth is at the center of our solar system.

Explanation:

to extend a country’s power and influence

john maynrd keynes developed new economic respose to the                           ( b. great depression if the 1930's)