What did the communists do first when they took control of the soviet union?

They didn't take over the soviet union, they created it from the downfall of Russia which was ruled by the czars(kings) at the time. It started off as soviet Russia but upon expanding into other states it became the soviet union. The first thing the communists did was kill of the bourgeois (rich upper class) as it was a "revolution for the working class".

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.