Slavery expanded after the american revolution for all the following reasons, except:
a. the cost of slaves decreased
b. the cotton gin made cotton production more efficient
c. western expansion and the defeat of native tribes opened new land to plantations
d. northern and overseas textile mills increased and expanded production

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

raymond can buy special closed cooling containers or a semi-truck with a air conditioned cooling system and an open box for the fruits,

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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.