What eighteenth-century mathematician, speaking of the positional principle, said "the idea is so simple that this very simplicity is the reason for our not being sufficiently aware of how much attention it deserves?

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?