text: building the st. lawrence seaway in the 1950s was a large project involving the resettlement of communities..? building the st. lawrence seaway in the 1950s was a large project involving the resettlement of communities.invstigate this project to find out where resettlement occured. list several advantages of the project. i don't know about resettlement, but the seaway let large ships go up the st. lawrence to dock at inland ports such as detroit and chicago.  it also let lamprey eels into the lakes; and these pests did nasty things to the native fish population.  efforts to control the eels have continued over many years and have been fairly effective.