Trace and explain the changing economic and political roles that contributed to the emergence of the United States as a world power.
McKinley's Foreign Policy
MCPS Net Investigation; by Mary D. P. Wagner
http://www.mcps.k12.md.us/schools/blakehs/staff/wagnerm/NetInv/mckinactiv.htm
Spanish American War
MCPS Net Investigation; by Mary D.P. Wagner & Lisa Sorensen
http://www.mcps.k12.md.us/departments/isa/ninvest/SpanAmWar/spanamerwarindex.htm