How did the Colombian exchange impact people in the globe?

What pact signed on 1949 reinforce that the united states would not return to an isolationist policy

The 14th amendment overruled the supreme court case of dred scott vs. sandford. the landmark supreme court case determined which of the following points? a.slaves could not be citizens b.non-landowners could not be citizens c.blacks could not be citizens d.all persons born or naturalized in the united states vary differently in citizen status.

How did testimony such as this from the triangle shirtwaist factory disaster affect the workplace?