Since the mid-1970s, how has class inequality in the united states changed?

The correct answer is increased due to decreasing tax rates for the wealthy and stagnating salaries for the middle class

Most of the wages have only slightly increased while the earnings and wealth of the upper class and the big elites had increased drastically because of many tax cuts. People believed that through tax cuts the people would get more money because the companies could give them higher salaries, but it backfired as big companies hoarded extra money.