Equality maxed out with respect to the United States, and that with respect to white males. However, there was much more global inequality. Western Europe, Soviet Union, China, and Japan had all been devastated by having WWII fought on their land. Their cities had been bombed out, and large percentages of their population killed or maimed. India had just gained independence from Great Britain and trying to get it bearings as well as navigate a bitter rivalry with Pakistan.

In the 50's and 60's, the US was basically the only developed country that hadn't had its homeland destroyed by the war. This meant that there was very little competition for US companies.

In addition, the labor markets were tight. Remember, half of the population (women) were not expected to be in the job market long term, but rather to get married and stay at home. There was outright discrimination against people of color. Thus you had very little outside competition for US companies, with tight labor markets in the US, this resulted in generally good pay and benefits for US workers.