How did the issue of slavery and the Civil War affect the Northwest?

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?

The national security act of 1947 reflected:

How was the u. s. economy different from european economies following world war 1?