Over time, the united states government has backed the paper currency it printed in all of the following ways except

a.
gold

b.
government's promise to pay

c.
silver

d.
copper

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

to reform the distraught soviet union, the democratization of the communist party was promoted through party secretary mikhail gorbachev's policies of “perestroika” and “glasnost.” perestroika refers to the reconstruction of the political and economic system established by the communist party.