In the period after circa 1450, trade along the routes shown on the map declined in large part because of the a. decrease in the demand for African manufactured goods in Europe
b. collapse of European economies in the wake of the Bubonic plague
c. disruption caused by the adoption of new gunpowder weapons
d. increase of maritime trade along the African coast

porter is writing economic history because he is focusing on the cost of developing vaccines.

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.

no one really purchased it themselves, it was all america, they had debates etc.