30 ! what were the social concerns of the 1970s?

Stagflation, price control. Keynesian policies were failing. The oil crisis showed the stupidity of price controls. The stagflation showed that an increase in the money supply does not increase wealth.
In the 70s we still had Vietnam, we had Nixon, there was Watergate, Gerald Ford, Paul Volcker raising interest rates to 20% in the Federal Reserve, government bailing out Chrysler.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.

It might be the second one