Final answer:
Arthur Ashe won Wimbledon in the year 1975, becoming the first African American man to achieve this milestone in tennis.
Step-by-step explanation:
The year that Arthur Ashe won Wimbledon was 1975. This was a historic event because Ashe became the first African American man to win the singles title at Wimbledon. His victory was not only significant in the realm of tennis but also had a wider cultural impact during a period of ongoing civil rights struggles.