A map of africa titled years of independence for african countries.
the years to 1949, 1950-59, 1960, 1961-64, 1965-69, 1970-75, 1976-79, 1980 plus, and n / a are in the legend key.
most of the countries are in the year 1960 with only 3 at 1949 and 2 at 1980 plus. based on this map, when did most countries in africa gain independence?

1. in the 1920s and 1930s
2. in the 1930s and 1940s
3. in the 1950s and 1960s
4. in the 1970s and 1980s