How did the truman doctrine undermine soviet attempts to spread communism?
it required us military intervention in communist revolutions.
it gave funds to soviet-occupied countries in europe.
it provided military support to countries fighting communism.
it created an alliance of western countries to fight communism.

Which options most accurately assess the impact of transportation improvements (e.g., railroads, canals, steamboats, transcontinental railroad) on the settlement of the west? ***(select all that apply.)*** a. they led to an increase in population density. b. they made it easier to travel long distances. c. they in establishing towns. d. they led to the development of the fur trade. e. they allowed for international travel.