There is a function called csvread that should load the file.
If your file has headers (or anything other than numbers), the command won't work. To get around this, set it to have an offset of one row (and no column offset).
data=csvread('data_US.csv') or data=csvread('data_US.csv',1,0)
You can also select a more specific range of data if you need to, so check out the documentation if that's something you want to do.