Interstate commerce refers to trade between
a.
two geographic regions
c.
the states
b.
two different continents
d.
two different countries

The states

Insterstate commerce, as the name indicates, refers to the buying, selling and exchange of commodities, money or goods between different states. This type of commerce is regulated by the federal government (as established in Article I of the United States Constitution).

immigrants from northern and western europe continued coming as they had for three centuries, but in decreasing numbers