Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
No,
Yes. For 4 years.
Yes. For 200 years.
Yes.
My relatives are great great uncle’s father and my sister.
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This is true. The best can be seen on examples such as the great depression which led to numerous other issues, while the roaring twenties when everything was calm and sound were also very politically stable for the lives of Americans.
It stabilizes the magnetic field in the outer core.
