Adding Coordinates Changes Map Projection

[MacallHock]

Hi. I am trying to add my csv file of coordinates to a ArcGIS Pro map but every time it changes the projection of the map and makes it look weird. I have tried a few different things for setting the coordinate system and nothing works. I have also checked that coordinate system of my base map is the same as my added coordinates are the same and they are. I'm not sure what else to try.

[DanPatterson]

an example of a row of coordinates?

what is the coordinate system?

Have you mixed up Longitude (x) and latitude (y) if they are geographic coordinates?

[MacallHock]

Name Latitude DD Longitude DD
MC2U1 70.442873 -156.480138
MC2U2 70.442878 -156.479957
MC2U3 70.442963 -156.480008
MC2U4 70.442956 -156.480018
MC2U5 70.442976 -156.480183

Heres a few lines of the coordinate data. I'm very new to ArcGIS but I'm pretty confident I have not switched up the x and y. Thanks!

[DanPatterson]

Change the row names to remove spaces.  

eg Name, Latitude_DD, Longitude_DD

Your file is space delimited and not comma-delimited, It would be best to use a comma-delimited file so if you have the original source of the data (eg from a spreadsheet) export it as such.

Take a look at the section on creating points from a csv file in....

Create points from a table—ArcGIS Pro | Documentation

Your data are indeed geographic coordinates probably with a WGS84 data, so define it as such.