Illustrative examples can be tailored to local contexts. In discussing migration in national geography standard 9, a school district in california might examine migration from southeast asia, a school district in flourida might devote attention to migration from the caribbean, and a school district in texas might consider migration from mexico and central america. Simliarly, a new england school district might discuss migration of french canadians in the nineteenth century whereas a school district in louisiana might look at the migration of acadians in the early eighteenth century. School districts in cichago and baltimore might look at the flows of african americans from mississippi and alabama in the early and middle twentieth century; whereas school in cincinnati and cleveland might choose migration from appalachia during the same period. In all cases,despite differences in specific place and time, the basic geographic concepts would be identical: push and pull factors, migration streams, migration fields, distances, the role of intervening oppurtunities.