Which 20th-century president's policies were most consistent with the sentiments expressed in "the gospel of wealth"?

The correct answer is Ronald Reagan.

The gospel of wealth was about using surplus wealth to help the people and the society. This was reflected in Reagan's trickle down economics where the government was supposed to cut down taxes of the companies and in return the companies would use this extra money to increase wages of  the workers and help them live better.

More than 4 million enslaved hunan beings in the south and they touched every aspect of the regions social, political and economic life.

It can provide a social code to protect each citizen's future economical earnings. and then obviously defending the country from invading countries.