What was not true of the nonaggression pact?
a. it was signed by stalin and hitler
b. it secretly divided poland between the soviet union and germany
c. it promised that germany would never attack the soviet union
d. it involved germany, the soviet union, and czechoslovakia

A. It was signed by Stalin and Hitler.

Explanation:

That´s incorrect. The Nazi and the communist Soviet dictators were aware and approved all the contents of the Non-Aggression Pact, but they did not sign it themselves. The accord, also called Pact Ribbentrop-Molotov, was signed in Moscow on August 23, 1939,  by the ministers of Foreign Affairs of the III Reich and the USSR, Joachim von Ribbentrop and Vyacheslav Molotov, respectively.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.