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How do I make these two feature classes compatible in ArcMap 10.4?

(1) -->
Data Type: Shapefile Feature Class
Shapefile: C:\Users\craigugoretz\Desktop\CA_counties\CA_counties.shp
Geometry Type: Polygon
Coordinates have Z values: No
Coordinates have measures: No

Geographic Coordinate System: GCS_WGS_1984
Datum: D_WGS_1984
Prime Meridian: Greenwich
Angular Unit: Degree

(2) -->
Data Type: Shapefile Feature Class
Shapefile: C:\Users\craigugoretz\Desktop\NHD\WBDHU12.shp
Geometry Type: Polygon
Coordinates have Z values: No
Coordinates have measures: No

Geographic Coordinate System: GCS_North_American_1983
Datum: D_North_American_1983
Prime Meridian: Greenwich
Angular Unit: Degree

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    Welcome to GIS SE. As a new user please take the Tour. If you search on the topic "NADCON" especially in tandem with "ArcGIS", you'll likely find a great deal of documentation. You can then edit your question to include relevant details of what you have tried, and whatever difficulty you have encountered. – Vince Jan 15 '17 at 4:35
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Load those layers in ArcMap, then click on one of them (right button), click "export data" and save your layer with coordinate system from other layer.

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    This may not work correctly without specifying a transformation (which is the same step needed to use the Project utility. – Vince Jan 14 '17 at 22:35
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    If they line up fine, you can use this workflow. If the two layers seem offset around a meter, then do as @Vince suggests and set a transformation. Try NAD_1983_To_WGS_1984_5. – mkennedy Jan 15 '17 at 15:42

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