Economic conditions after World War I lead to

restrictions on trade and immigration. Soon, this set up the stage for the Great Depression. I will go further if you tell me to.

b: the exchange of coined money

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.