Albers Equal Area Projection

http://www.mgaqua.net/AquaDoc/Projections/Projections_Conic.aspx

Albers Equal Area Projections are used for maps showing specifically the United States, or large areas within its borders. This conic projection is also used for other large countries as well. The Albers Equal Area Projections have equal area and are excellent for thematic maps because it keeps the states at the same size. This can be used to display population distributed across a state or regions area.