How did railroad expansion make natural resources more available in the us?
o by increasing the amount of natural resource deposits
o by making it possible for natural resources to be transported to different cities and towns
o by using natural resources to build tracks and train equipment
o by transporting people to cities and towns where they could purchase natural resources
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the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

c. free trade can lead to low pay for workers in poorer countries.

europeans carried a hidden enemy to the indians: new diseases. native peoples of america had no immunity to the diseases that european explorers and colonists brought with them. diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to american indians