Which early 19th century invention sparked the expansion of slavery westward from the deep south?

4. any area in which one nation has power over another; i.e. - this happened to china when it was defeated by japan

In which supreme court case did the court rely on the concept of implied powers to make its ruling? a) gibson v. ogden b) mcculloch v. maryland c) dartmouth college v. woodward d marbury v. madison

Why do many scientists suppose the land bridge theory of migration?