1) People of Europe are very friendly and helpful by nature.
2) People from Europe are very friendly and helpful by nature.
What's the difference between the sentences above?
Does sentence #1 suggest that you are an outsider living in Europe at the time of making this comment?
Does sentence #2 suggest that you are making this comment by observing people who came from Europe and are living in your continent ?
2) People from Europe are very friendly and helpful by nature.
Does sentence #2 suggest that you are making this comment by observing people who came from Europe and are living in your continent ?
1) People in Europe are very friendly and helpful by nature.
Does sentence #1 suggest that you are an outsider living in Europe at the time of making this comment?
It could also be a statement made by anyone in the world who has formed a picture of Europeans as being 'friendly and helpful'.
3) People of Europe : the War is over!
The use of 'of' here is similar to when you say, The Government of India.
For a person to say (3), it would be part of an oration by some political leader.