6. What put an end to the boom in canal building? A the introduction of trains
B the population growth in eastern cities
C the growth of turnpikes
D the development of the steamboat

. political or economical policy that isolates a country from participating in international relationships. it has been suggested that the united states participates in isolationism because of its lack of involvement in particular wars or alliances.

with my recent question

the citation´s place is in position 4.

as carl becker

pointed out during the rise of european fascism after world war i

for democracy to prosper, it needs “a certain measure of economic security”

.

example (johnson 4)

passing amendments to the constitution.