What kept china isolated during ancient times

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity

Ahistorian who compares the expansion of political systems to the expansion of economic systems is organizing history by

Aregion with a specified number of voters is referred to as a a. precinct city country d. district ud