.BG
.FN usa
.TL
United States Coastline and State Boundaries
.CS
usa(states=TRUE, coast=TRUE, add=FALSE,
    xlim=c(65,135), ylim=c(24,50), fifty=FALSE)
.AG states
logical flag to control whether state boundaries are
plotted.
.AG coast
logical flag to control whether coast-line is plotted.
.AG add
logical flag.  If `TRUE', plot is superimposed on existing
plot.  Otherwise, a new plot is generated.
.AG xlim
optional limits for the \f2x\fP-axis (longitude).
.AG ylim
optional limits for the \f2y\fP-axis (latitude).
.AG fifty
logical flag.  If `TRUE', boxes are drawn in the Pacific Ocean to
represent Alaska and Hawaii.
.GR
.PP
The plot is done in correct physical proportion.
The coordinate system set up for the plot uses negative longitude,
so that \f2x\fP-values increase from left to right on the plot.
.EX
usa(states=F) # the U.S. without state lines
usa(xlim=c(65,85),ylim=c(35,50)) #plot the north-east
# the example plot is produced by:
usa()
text(state.center,state.abb,cex=.5)
.PI
.KW aplot
.KW hplot
.WR
