The Mayflower Compact was written to establish a temporary government until a permanent one was established.
Answer:
It probably hasn't happened because the theory behind Marxism is wrong. A government can't control the economy efficiently enough for it ever to work well enough for communism to be practical. That's why there are almost no communist countries left today.
Until the agricultural revolution, humans were mainly hunters and gatherers who did not raise plants or animals for food.
Two consequences :
- The California Gold Rush had an severe environmental impact.
- The rivers were clogged with sediment.
