The time period during which it took the longest for the global population to increase by one billion people was from 1804 to 1927.
Here's why:
1. From 1804 to 1927, the global population grew from around 1 billion to 2 billion, which took 123 years to achieve this increase of one billion people.
2. In contrast, the other time periods listed in the question, such as 1927-1960, 1960-1974, and 1974-1987, witnessed faster population growth rates compared to the 1804-1927 period.
3. The significant advancements in healthcare, sanitation, agriculture, and technology during the 19th and early 20th centuries contributed to the slower population growth rate during this time.
4. Therefore, based on historical data and the pace of population growth, the period from 1804 to 1927 stands out as the time frame where it took the longest for the global population to increase by one billion people.
By understanding these points, you can see why the 1804-1927 period is the correct answer to the question.
