What european country was famous for their great explorers?

During the cold war, the united states was involved in certain regional conflicts due to fears later called the domino theory, which stated which concept?

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?

How did the united states ironically create a slaverybased market economy and democratic political system?