What helped blacks begin to make a mark on the business world during the 1920s?

More received a college education.

In 1921 Sadie Tanner Mossell Alexander was the first African-American to receive her PhD in economics. The first ever exhibition of the African-American community exhibiting their artistic talents was organised. Harmon Foundation was developed in 1921 to assist African-American artists.Thus in this manner, in the 1920's many African-Americans begin to make a mark in the business world as more and more of them were getting educated

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a countries leader should be motivated by the common good of the country.