Which famous explorer from the west is known for his journeys along the silk road? marco polo or christopher columbus?

What is the liberal pov on social issues

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?

Who were the only people that were not allowed to be a citizen in the roman empire