What was the climate like in America at the time when Joe Louis was at the height of his career?

The correct answer is: racism and World War II.

Explanation:

Joe Louis was a professional boxer from the United States who was heavyweight champion for 12 consecutive years (1937 to 1949). He came from a poor family and was black skin. He started going to a gym where he learned how to box, and his talent attracted professional promoters and good fights. In 1936 he fought against Max Schmeling who was a german boxer considered a stereotype of german race, and that became his most famous opponent and also a good friend of his.

African-American people saw him as hope for inclusion in sports and in society, because even thought slavery was abolished in 1865 with the 13th Amendment, in the United States racism continued until even after the second half of 1900s. But Joe Louis was liked by people inside and outside the ring and even was recognized as a nationwide US hero. And therefore he was adding to the cause for the end of racism for African-American people.

Also in the height of his career World War II (1939-1945) broke out. He enlisted and was an important promoter for African-American men to enlist the army.