The U.S. justified its involvement in the Vietnam War by stating that they were fighting against communism. At the time, the Soviet Union was seen as a huge threat and there was a rivalry between the two nations.
Roundheads were Parliamentary/Puritan soldiers who wore tight fitting un-orimented metal helmets, while Cavaliers were kings men who wore large hats with feathers as their uniform headdress.
Some differences between the round-heads and the cavaliers are that the cavaliers supported the King and the round-heads supported Parliament.
I think The most suitable answer would be : Government control would prevent those industries from taking advantage of small farmers
Farmers were heavily relied on the railroads to bring their goods to the market. If America's railroads were controlled by corporation , they could imposed a really high transfer price to the small farmers
hope this helps