Final answer:
The population in the year 2000 was approximately 300 million, according to the US Census Bureau data.
Step-by-step explanation:
The population in the year 2000 was about 300 million. According to the data from the US Census Bureau, the population of the United States grew from 76 million in 1900 to approximately 300 million by the year 2000. This growth reflects the demographic changes and is calculated by the Census Bureau, which was set up in 1902 to track where the U.S. population was living and how the Congress. The population in the year 2000 was approximately 300 million people.
The information provided states that in the United States, there are about 300 million people in the present day, so we can assume that the population in the year 2000 was also around that number.
Therefore, the correct answer is D. About 300 million.