| A | B |
| The refrigerated box car | This innovation helped make fresh beef available on the east coast in the mid 1800's |
| Trail of Tears | forced march of Cherokee Indians to Oklahoma reservations |
| Monroe Doctrine | This was intended to prevent European expansion in western hemisphere |
| Brown v. Board of Education | This made segregation unconstitutional |
| How to count slaves in census | This was a conflict between North & South when writing Constitution |
| Capable military leadership | This was a strength of the South during the Civil War |
| Federalist papers | James Madison, A. Hamilton & J. Jay wrote these articles to help with Constitutional ratification |
| Cuban Missile Crisis of 1962 | a confrontation between the U.S. & the Soviet Union |
| World War I | Zimmerman Note & Lusitania sinking happened with this war |
| Cotton production | dominated Southern economy by the 1850's |
| North Korea | Remained controlled by Communists after the Korean War |
| computers | type of business that would be located in California's "Silicon Valley" |
| Cuban Missile Crisis of 1962 | ended when Soviet Union withdrew nuclear missiles from Cuba |
| The Triangular Trade | A Colonial trade pattern between England, Africa and the Americas |