Was the monroe doctrine successful in keeping the U. S out of European affairs?

Along narrative poem about the heroic figure is

Which answer best describes an advantage of shipping goods by canal? a) most towns would rather have canals then noisy railroads b) goods could travel very fast downstream in the canal system c) traveling by boat is a much more relaxing way to transport goods. d) heavy loads of goods could travel by boat more easily then if pulled by horses.

Aclaim about history is most likely not valid if it has which of these characteristics?