Contour Map-Change Boundaries and Legend in ArcMap

[ElizabethBee]

I have Contour maps that I want to change in ArcMap.  The first thing I want to change is to keep the contours inside of the U.S. boundaries.  I have used a U.S. boundaries shapefile, but for some reason it goes outside the U.S. boundaries.  I also want to change the legend so that they are integers with no decimals.  I am attaching snapshots of my maps.

[DanPatterson_Retired]

related? https://community.esri.com/thread/211467-interpolation-problem

you can change the 'label' portion of legend entries to whatever you want

[ElizabethBee]

I am still having a problem.  I am able to keep my raster within the boundaries of the U.S. but it is not extending to cover all of the U.S. as it should.  I am attaching a snapshot of what it looks like.

[DanPatterson_Retired]

strange... set the extent manually ( in the extent 'as defined below')