Areas where foreign nations claims special economic privileges in another country

Why did leaders such as siddhartha gautama abandon hinduism to createbuddhism around 500 bce:

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

Did the spanish settlers and missions have a positive effect on world history? why, what did they do that was positive? why was the treaty of paris (1763) good for the world/world history? did the plymouth colony have a positive effect on world history? why, what did they do that was positive?