by 1800 the world population was 1 billion people civilizations existed for thousands of years prior to 1800 based on your knowledge of world history why do you supposed to take the world population to reach a billion by 1800

I think its 100,000 years it would be 1 billion at 1800s

the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker